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Mariah Carey's ex-fiance is letting loose these days ... at least that's how he rolls on vacay.

James Packer was aboard his yacht in Tahiti Thursday ... and from the look of things, he's still reeling from his split with Mimi last October.

It was pretty nasty -- she burned her $250k wedding dress and demanded $50 mil claiming he uprooted her from her life in NYC and caused emotional distress after canceling the South American leg of her world tour.

Tommy Lee's post-Mötley Crüe years look a lot like he's still on the road picking up hot chicks ... like the super young brunette who was all over him after a dinner date.

The 54-year-old extremely blessed drummer had a smokin' pair of long legs and burgundy lips Wednesday night in Calabasas -- and they belong to a 30-year-old ex-Vine star Brittany Furlan.

She once had the biggest following of any woman on Vine, while Tommy's had the biggest ... popularity among rock drummers.

Good to see Tommy's still living by his motto: Live long and prosper.

Lady Gaga's last day of Spring played out just like the 'Little Mermaid' t- shirt she was wearing Tuesday while out with her agent-turned-boyfriend, Christian Carino.

The couple looked totally enamored with each other on a beach walk Tuesday in the Hamptons. News they were dating first came out in February, around Gaga's Super Bowl halftime gig.

Sure, she recently made out with Bradley Cooper for "A Star Is Born" -- but now it was Christian's turn to kiss the girl. And in case he needed any help ...

Percussion ...

Strings ...

Winds ...

Words ...

There you see her, sitting across the way...

Jay-Z is out and about in L.A. and smiling like the proud new dad he is ... which could mean there's good news where Beyonce and the twins are concerned.

Jay was in West Hollywood Monday morning -- the first time he's been spotted away from the hospital since Bey gave birth almost a week ago. TMZ broke the story ... the newborn boy and girl have remained in the hospital due to a "minor issue."

Unclear what Jay-Z was doing, but he was leaving a complex that has a SoulCycle ... and we know he's been known to get his SC on from time to time.

We're told he's been at the hospital with Bey and the twins nearly round the clock, and was seen arriving there early Monday morning.

He didn't have much to say to photogs outside SoulCycle, but we're hoping the smile said it all.

Bobbi Kristina Brown's grave now has her headstone in place ... between her mother and grandfather.

The headstone is inscribed, "Resting Peacefully" and also has a musical note along the border. Bobbi Kristina was laid to rest in a family plot, right next to Whitney Houston.

It appears loved ones have visited the New Jersey cemetery recently -- flowers and an angel-like figurine have been placed on the marker.

Bobbi Kristina's headstone was installed as the investigation into her death continues. As we reported ... authorities in Georgia spoke to Nick Gordon's current girlfriend after he was arrested for assaulting her.

Gordon remains a person of interest in Bobbi Kristina's death.

Prince William comforted families devastated by the London fire that killed as many as 58 people.

The Prince hugged an inconsolable woman whose husband went missing after the blaze, which consumed the entire building. It's a break from protocol ... embracing commoners, but the Prince clearly wanted to show compassion. Other families walked away from the visit to say William truly seems to care about their grief.

The death toll is expected to rise ... possibly to as many as 70 victims.

Drake's dad must have a thing for adventure, mystery and international intrigue, because he's dressed exactly like a character who specialized in just that.

Dennis Graham was seen leaving the Nice Guy in WeHo Saturday night with his girlfriend looking just like the famous '80s video game baddie Carmen Sandiego ... red trench coat, fedora and all. Just one step up from his usual stylish outfits.

Bad news for the rest of us -- Jennifer Lopez and Alex Rodriguez are getting even more bronzed and beautiful than they already are.

The couple jetted off to the South of France, and boarded a yacht off Antibes for a day in the sun. J Lo wore a sexy, tiny crochet monokini, and A-Rod wore ... well, who really cares?

He did try some high diving off the deck, but the bigger point is they looked freakin' amazing while soaking up the R&R.

Don't worry, they applied plenty of SPF.

Looks like North West is down with Mom's new low-key approach to life, 'cause she got turnt for her 4th birthday party at a Ruby's Diner.

Yes, Kim Kardashian and Kanye West threw a family-only shindig Thursday evening in Calabasas. Grandma Kris Jenner and Kylie Jenner were there too, and looks like Nori opened gifts inside. She left with quite the haul, including a new bicycle.

We're told earlier in the day the family rented out Chuck E. Cheese's for North and friends.

Mom and Dad dressed down -- camo for Ye and sweats for Kim, but the bday girl definitely stole the show with a vintage Snoop Dogg tank.

It's not next season's 'Bachelorette' cast ... it's just Leo DiCaprio, Tobey Maguire and Orlando Bloom kicking it in NYC. NBD.

We're used to seeing BFFs Leo and Tobey hang out, but Wednesday afternoon Orlando was suddenly part of the crew. No word where the trio was headed, but there's a good chance they had a trail of female fans following.

Tobey and Leo's group of friends have been known as the "P***y Posse" for years ... so adding Orlando is like the Golden State Warriors adding Kevin Durant.

Oh, the slaying they will do.

Jamie Foxx is enjoying the fruits of Shazam's labor -- 'cause why just cruise around L.A. in a Bugatti, when you can do it in a GOLD Bugatti?

Jamie and a female pal were seen driving around town in the highly conspicuous whip -- worth nearly $2 million bucks, and that's before the golden wrap job.

We knew his game show, "Beat Shazam," had a strong debut, but damn!

Man's got the golden touch right now, and he ain't afraid to flaunt it.

"Bachelor in Paradise" star DeMario Jackson certainly doesn't look like a man in the middle of a serious reality TV controversy.

DeMario was out with a bunch of his friends Tuesday night as the group hit up Saint & Second in Long Beach. He appeared pretty loose ... never mind the controversy surrounding him and co-star Corinne Olympios.

As we reported ... DeMario wants the pool sex video released because he feels he did nothing wrong.

Tobey Maguire's adorable kids have it good -- their dad was Spider-Man, and if he needs a time-out, Uncle Leo DiCaprio's right there on the spot.

Leo was all ears Tuesday as Tobey's 2 kids, Otis and Ruby, chatted him up during a stroll through Manhattan. Tobey's estranged wife, Jennifer Meyer, was there too. At first glance, ya might think -- this is weird, where's Tobey? He's there ... in the back of the group, taking a phone call.

Tobey's bff has remained a regular with this crew -- even after Jennifer and Tobey split last year. They all did dinner in L.A. recently with Leo's parents.

One big happy modern fam.

Bill Cosby is launching his defense in his sexual assault trial with one of his most powerful weapons ... his wife.

Camille Cosby walked arm-in-arm with her husband Monday as they entered the courthouse. Camille has been MIA for the entire first week of the trial. Conventional wisdom ... if you don't have a supporting spouse in the peanut gallery, it looks like you did something wrong.

Jay Z is jamming all the way down in Jamaica, and ya gotta wonder if pregnant Beyonce is waiting in vain ... back in L.A.

If ya missed the references -- Jay was spotted Friday in Kingston, where he was recording new music with Damian Marley ... in Bob Marley's legendary Tuff Gong Studio.

By most calendars, Bey should be within days of having the twins. Remember, Mathew Knowles recently told us she was "more than 2 weeks" away from popping -- and that was 3 weeks ago! So ... tick, tick, tick.

But Jay being a solid 6 hours away by private jet must mean the coast is clear ... for today, anyway.

Bottom line? Don't worry about a thing ...

Bill Cosby arrived to the courthouse Friday with comedian Joe Torry by his side, oblivious to the fact he dodged a fatal bullet courtesy of his own lawyers.

Cosby's attorneys had filed legal docs asking the judge to allow them to introduce evidence accuser Andrea Constand was gay. He bizarrely wanted to show the jury she deceived him ... suggesting he would not have had sex with her if he knew she was gay.

The prosecution claimed it was "victim shaming" and also violates Pennsylvania law which prohibits the use of evidence involving an alleged victim's sexual past.

The judge denied the defense motion, and unless we're missing something, the admission could have nailed Cosby's coffin shut.

Andrea Constand told cops she had a boyfriend when she was 14 and had sexual contact with a man when she was in her late 20's. That said, if she wasn't into guys, the prosecution could have destroyed Cosby's argument she consented to sexual contact with the comedian.