Amanda Bynes Troubling Behavior

And now ... "Where in the World Is Amanda Bynes?"

She's soaking in an Atlantic City hot tub -- or at least she was this weekend. Sources tell TMZ, Bynes checked in solo at the Revel Hotel ... where she stared into her phone while surrounded by strangers in the tub.

We're told she did pose for some photos with fans -- while wearing her famous blonde wig in the jacuzzi -- but if Amanda didn't like the way she looked, she demanded they be deleted ASAP.

Miley Cyrus says it's "impossible" that she's more than friends with Justin Bieber ... despite the public flirting ... 'cause she's currently engaged to someone else.

Miley called in to Hot 99.5 in D.C. this morning ... and actually responded when the DJ asked if the photos on TMZ showing Miley and Bieber flirting in public this weekend prove they're "more than friends."

Her response: "I'm ENGAGED!" she said, chuckling. "I'm engaged. That is impossible."

It's an interesting statement for two reasons -- first, it clears up the rumors that she broke things off with Liam Hemsworth.

Second, when it came to being more than friends with Justin ... her answer isn't exactly a strong "no."

Miley was also asked about Amanda Bynes -- and she says some interesting stuff.

Give it a listen.

Formerly troubled "Terminator 3" star Nick Stahl has some invaluable words of advice for Amanda Bynes ... if she wants to turn her life around, she should start by pulling the plug on her crazy Twitter account.

Stahl -- who famously struggled with drugs, alcohol and other personal issues in the last year -- tells TMZ Amanda's habit of constantly chronicling her every waking move isn't healthy ... and she should spend her time reconnecting with friends and family instead.

But Stahl's still optimistic, adding, "She'll figure it out. She's young."

"Ask Ashley" could be making a HUGE comeback ... with a dirty twist ... because TMZ has learned, Playboy is offering Amanda Bynes her very own radio show.

Playboy Radio offered Amanda a guest hosting gig yesterday -- but now, a rep for the station tells TMZ, execs want her around FULL-TIME ... and have officially submitted an offer for Amanda to host her OWN hour-long daily radio show.

The offer is for a one-week trial ... but if all goes well, we're told Amanda can extend the deal to a full year.

Playboy's pulling out all the stops to make her feel welcome too -- we're told the org. is willing to provide Bynes with a driver to take her to work ... as well as her very own producer to handle the show's logistics.

FYI -- Bynes became a breakout star on "All That" back in the day thanks to the popularity of her "Ask Ashley" sketches ... when she would give crazy advice to fans.

2:36 PM PT -- We JUST heard back from Bynes ... who, unfortunately, delivered some bad news for Playboy.

"I want to [do the show]," Amanda said ... "But I can’t because I’m recording an album!"

Sidenote: Amanda says she's an aspiring rap star.

Amanda Bynes followed through on her promise to get her nose fixed after seeing it in her mug shot ... and she tells TMZ she already wants to get another procedure ... ASAP.

In one of her post-arrest Twitter rants, Bynes said she was planning on "getting in shape and getting a nose job!"

Bynes -- who previously copped to having a nose job weeks before her arrest -- tells TMZ she got the procedure done yesterday in Manhattan and explains, "I have no bandage on. It's healing on it's own like my doctor asked."

But she's not stopping there, telling us, "I'm getting one more in 3 weeks, they are short amazing surgeries done while I'm awake but under general anesthesia. It's almost perfect."

She says once her nose "doesn't look so awful in photos" she will stop hiding from the paps.

Amanda Bynes says she doesn't do drugs ... but that's not stopping one company from asking her to be the new face of their portable vaporizers ... i.e. a contraption loved by ganja-lovers worldwide.

Chris Folkerts -- CEO of Grenco Science -- sent Amanda an offer letter this week, asking her to become a celebrity spokesperson for their new line of G-Pen vaporizers ... following her alleged bong-out-the-window arrest.

Chris says G-Pens are portable vaporizers which "provide the best way to vape oils, concentrates and aromatherapy regiments" ... but we all know what they really vape.

Folkerts says in the letter, "We think you'd be a great spokesperson ... we know you will love our vaporizers so much you will never use a water pipe or bowl ever again."

Fun Fact: The Game is also a celeb spokesman for the company. Soooo yeah.

Amanda Bynes has a serious addiction and TMZ has learned she just got herself another fix -- no, we don't mean drugs ... we're talking WIGS.

Bynes recently placed an order from Couture Princess Wigs for three Disney-inspired wigs -- one Cinderalla, one Barbie, and one Belle. She placed the order the day of her arrest and three wigs cost her a total of $830.00 (that includes shipping).

TMZ has obtained video appearing to show Amanda Bynes walking the streets of Buffalo, NY moments ago -- but the strange part ... she keeps telling the photog, "We're not in Buffalo."

The footage was shot by a self-described "fan" who tells us he noticed Bynes wandering around aimlessly ... sporting huge sunglasses and a brown wig ... and decided to strike up a conversation with her.

The woman never denies that she's Amanda Bynes -- but when asked why she's in Buffalo, she repeatedly tells the photog, "We're not in Buffalo."

We reached out to Bynes via email -- but she wouldn't confirm or deny if she was actually in Buffalo.

If it's NOT Bynes in the video ... it certainly would be a helluva coincidence -- 'cause the lady in Buffalo doesn't just bear a striking resemblance to Amanda, she also has the same tattoo on her arm.

Amanda Bynes is ADAMANT ... photos taken at a trampoline facility last night in Buffalo, NY are NOT her -- but multiple witnesses think the woman DEFINITELY was the alleged bong-chucker.

It's pretty bizarre ... pics surfaced of Amanda wearing a brown wig at the upstate Sky Zone ... and she went BANANAS on Twitter, cussing out bloggers who posted them.

"THAT'S NOT ME!" she tweeted, adding: "I've never been to SkyZone! That looks nothing like me!"

But TMZ spoke with several Sky Zone employees and patrons -- and they're 100% convinced it was her. What's more ... Amanda left a paper trail.

"Amanda had to sign a waiver," Sky Zone owner Rhonda See tells TMZ. "She has the same DOB and same tattoos ... she checked in using her middle name and same last name. She did not use 'Amanda.'"

Witnesses say Amanda was disheveled, frantic and distracted when she arrived around 7:15PM, asking guests to delete pictures and bumbling around during the tutorial.

"She wasn't really listening," fellow patron Christopher Zukas tells TMZ. "She kept leaving the group to go set stuff down and would come back. During the jumping she wasn't able to follow the rules and was even knocked over by a fitness instructor teaching a class."

Other witnesses say she calmed down after 20 minutes and happily bounced for about an hour -- seemed to be having fun -- then left in a waiting car.

Amanda got pretty detailed in her Twitter rant/denial ... going so far as to assert: "I don't own a brown wig!"

Just one little problem with that story ...

The Game thinks Amanda Bynes killed a guy in Arizona ... because The Game totally thinks Amanda Bynes is Jodi Arias -- whoopsies!!!

Game was hanging out in NYC Tuesday night -- when we asked if he'd been following the crazy Bynes saga ... to which he replied, "F**k Amanda Bynes ... isn't she the killer? She the person that killed somebody or something?"

Turns out Game was just thinking of Jodi Arias ... that heartless biatch who slaughtered her BF in AZ ... and when our cameraman corrected the rapper, he joked -- "Yeah, I get my killers mixed up."

Check out the video -- it's pretty funny.

The Amanda Bynes drug case is falling apart ... FAST ... because the cops have absolutely NO HARD EVIDENCE that Amanda was ever in possession of weed, this based on information TMZ has obtained from law enforcement.

An NYPD official told TMZ ... the police report mentions NOTHING of any marijuana recovered at the scene. According to the report, cops saw Amanda throw what they believe is "drug paraphernalia" out the window. The report also says cops smelled "a strong odor of marijuana."

Based on multiple calls to law enforcement and others ... it appears NO DRUGS were recovered ... and that's what Amanda has been saying all along.

As for the alleged bong ... it's almost certain it will never be admitted into evidence. TMZ broke the story ... our producer spotted glass remnants on a sub-roof Tuesday and then called police and asked if they had inspected it. He was told they hadn't, and was asked for the location where the glass was found. Cops arrived a short time later and presumably checked the sub-roof.

Here's the problem ... No one knows if anyone tampered with the glass remnants which sat for days, in the rain. The chain of custody has been irretrievably broken and it's virtually certain the glass would not be admissible into evidence.

Short story ... even if prosecutors try to nail Amanda for reckless endangerment by throwing something out the window -- cops say she confessed to throwing a vase but she denies it -- there's no physical evidence of what was allegedly thrown. We've spoken with several lawyers who say it will be extremely difficult to convict her on reckless endangerment without physical evidence.

Short story -- if you're betting on this one, Amanda seems to be a pretty safe gamble.

Despite all the craziness ... and the wigs ... and the legal drama, David Spade says he still sees Amanda Bynes for who she really is -- a hot piece of ass.

Spade was hangin' at The Improv last night with his "Grown Ups 2" co-star Nick Swardson -- when Dave dropped some serious truth bombs about the ongoing Bynes saga.

"I'm scared of Amanda Bynes," Spade said ... joking that she'll call him "ugly" on Twitter if he says anything unflattering about her.

But Spade did rank Amanda's hotness -- and it's obvious, he's a fan.

"If you cut out all the 'stuff,' ... she's technically, for all intents and purposes, very pretty -- but I think she's getting in her own way."

THIS could be the shattered bong Amanda Bynes allegedly threw out her 36th-floor apartment window last week.

Our TMZ producer went on the hunt today and found the shattered glass on the 3rd floor of the building ... it's a sub-roof that can be accessed by using a ladder.

An official in the building allowed our guy to check it out, and he found what looks like a bong -- small broken bits of glass, light and dark blue in color, with no markings and no broken bottle ends or tops. Some of the pieces of glass had what appeared to be black residue.

Amanda has said she threw a vase out the window, but our producer says it doesn't look like a vase to him. As for the cigarette butts, our producer says they were scattered all over the sub-roof.

A building employee told our producer cops didn't check the sub-roof during their investigation. We were told cops would check it out later today. Cops just arrived at the scene.

Amanda Bynes straight up LIED when she accused an NYPD officer of "slapping" her vagina during last week's bong arrest ... this according to cops.

After Bynes made the allegation on Twitter this weekend, the NYPD says it launched an internal investigation to see if there was any truth to Amanda's claim.

But NYPD Deputy Commissioner Paul J. Browne tells TMZ ... "Investigators have found no evidence to corroborate Ms. Bynes's allegations."

"To the contrary," Browne says ... "a credible civilian witness who was with the officers throughout told investigators that none touched Ms. Bynes inappropriately or otherwise engaged in misconduct at any time."

Amanda Bynes is now claiming the tweets bashing Rihanna (pardon the pun) did not come from her and were actually mocked up by someone else ... then she went on to say some other crazy stuff.

Bynes went on another rambling Twitter run this afternoon, in which she says, "I saw a bunch of mocked up tweets about me bashing Rihanna in my mentions. I'm followed by so many people that someone is always mocking up fake tweets so I feel the need to address them!"

From there she goes on to say ... well, your guess is as good as ours:

"That's one of the mocked up images, they took photos of me from outside and morphed them onto someone else's body. I am allergic to marijuana and alcohol but I smoke tobacco. Why does Rihanna smoke weed and not get in trouble for it but I smoke tobacco and people think I'm on drugs? I refuse to be treated like someone I'm not, which is why I fought for myself and am suing everyone involved. I don't need to go to rehab. There is never a drug or alcohol in my system! I'm sick of all the lies! What would you do if someone accused you of things you didn't do and yet you still had to be in jail at all over it! I'm so offended but I am so educated that I know cops cannot illegally enter my apartment, sexually harass me, arrest me, take me to a MENTAL HOSPITAL, then lock me up for a crime I didn't commit. I'm suing them all for this upsetting nightmare. My lawyer knows I'm a model citizen who doesn't partake in drugs. He's going to court this week to set the record straight again on my behalf. Thankfully I'm an educated multi-millionaire who knows better than to speak to perverted unjust cops without my lawyer."

Amanda Bynes says she is planning to unleash a hailstorm of lawsuits against the NYPD and her apartment complex ... all over her arrest earlier last week ... or as she puts it, her "mistaken arrest."

Bynes just went on another glorious Twitter rampage, saying she plans to file a lawsuit against the NYPD for:

-- "Illegally entering my apartment"
-- "Lying about drugs on me"
-- "Lying about me tampering with non existent drug paraphernalia"
-- "Being put into a mental hospital against my will"
-- "Then locked up overnight for coming home after a facial and working out with my trainer like the good girl that I am."

Bynes also claims she's allergic to drugs and alcohol and is "proud to not be a drug or alcohol user."