Good Morning America

"Bachelor" star Juan Pablo has told Warner Bros. he won't do ANY post-season publicity for the show ... and for its part the studio is saying good riddance.

Sources connected with the show and the studio tell TMZ ... Juan Pablo outright refused to appear on "Good Morning America" Tuesday, and made it clear he was done with publicity of any sort for the show.

Our Warner Bros. sources say that's just fine with them, because they think he damages the "Bachelor" franchise because of his d-baggery.

And even GMA wasn't fighting to get Juan Pablo on the show.

As for the show itself ... we're told producers grew to HATE Juan Pablo, and it appears the feeling was mutual.

NBC is coming down like a hammer on celebs who want to get on Jimmy Fallon's show ... if they dare do a show on CBS or ABC ... they can forget about "The Tonight Show."

Sources connected to CBS, NBC and ABC tell TMZ ... the Peacock network believes Jimmy Fallon's ratings success gives them extreme bargaining power. They put the word out to celebs, agents and publicists ... if they want to be on Fallon they can't appear on ANY other network ... and not just shows that go head-to-head with Jimmy, but morning shows as well.

We're told NBC is saying the stars who go on Fallon are also allowed to appear on "Today," "Dateline" and any similar shows they air, but that's it.

A GMA source tells TMZ ... they've already gotten fallout from people they were trying to book.

Fallon is dominating late night .... crushing Jimmy Kimmel by bringing in more than twice the number of viewers.

Honey Boo Boo is mysteriously bailing on public appearances ... and we know the reason -- a smashed Pumpkin.

Boo Boo was a no-show this morning on "GMA" and we're told she won't show up at Katie Couric's show either.

Turns out the kid's family ties are more important than mugging for a camera. She's been spending time in the hospital with big sis Pumpkin, who was badly hurt in the family car accident last week. Pumpkin suffered severe chest bruises, a concussion and weakness in her legs.

She can be annoying, but she's a good sister.

Robin Roberts just officially came out of the closet ... telling the world she's gay and has a longtime girlfriend.

Robin just recounted her triumphs over the last year on her Facebook page ... talking about her battle with cancer and how she overcame the odds and regained her health.

In the middle of her Facebook essay she said, "I am grateful for my entire family, my long time girlfriend, Amber, and friends as we prepare to celebrate a glorious new year together."

It's kind of cool the way she did it, she didn't scream it from the mountain tops ... but she revealed her true self in an authentic way.

Good for Robin.

Robin Roberts -- who came out yesterday -- has been open about her sexuality for years ... she just didn't feel the need to go public until now.

Sources close to Robin tell TMZ ... everyone in her life -- both personally and professionally -- knew she was gay and in a 10-year relationship with Amber Laign. The 2 of them met in San Francisco through mutual friends.

Amber is a massage therapist who specializes in helping people with injuries.

As for their relationship ... our sources say Amber was utterly devoted to Robin when she went through both of her illnesses -- breast cancer in 2007 and Myelodysplastic Syndrome in 2012. Robin was extremely ill and we're told Amber was her rock.

As for why Robin came out yesterday ... we're told she never felt the need to tell the world, but at the end of such a difficult year she wanted to acknowledge what Amber did for her.

Sam Champion is leaving ABC's "Good Morning America" partly because he and his hubby want to start a family and partly because of his thirst to become a honcho ... ABC sources tell TMZ.

Our sources ... who are extremely familiar with the situation ... say Sam has been chronically unhappy at GMA. We're told he wanted his own show -- badly-- but ABC execs weren't biting.

So, Sam jumped to the Weather Channel (which is co-owned by NBC), where he will anchor the network's new flagship morning show and also serve as managing editor.

Our sources say Sam wanted to be the one who replaced Larry King at CNN and he was shocked when he wasn't tapped. As one source put it, "Sam loves power, and becoming managing editor (of the Weather Channel) gives him that."

Oh, by the way, our NBC sources say Al Roker -- NOT a Sam fan -- is "pissed" his Weather Channel show will be Sam's lead-in.

Another reason Sam bailed from GMA is that he and his husband want kids and the hubby refuses to leave Florida (GMA is in NYC).

We're told Sam will be spending about half his time in Miami so the kids will know his face in person and not just on the tube. As for moolah, we're told its a lateral move. Our sources say Sam was pulling in around $2.5 mil at GMA and he'll be making around the same at the Weather Channel.

$2.5 mil for weather ... now THAT'S making it rain!!!

Well the Jonas Brothers finally explained absolutely ... NOTHING about why the band is dunzo during a bizarre GMA interview this morning.

Nick Jonas came closest to breaking down their issues when he acknowledged, "We've had some complications in the group for a long time, without addressing them."

Nick seemed to be talking about disagreements over music -- but it's hard to say for sure since he was so damn evasive!

As we've told you ... Joe Jonas was spotted around Hollywood with a well-known addiction specialist days after the guys pulled the plug on their concert tour. Joe and his bros never addressed that -- though to be fair ... GMA never asked.

Watch the clip Jonas fans ... maybe you can figure out what the hell really happened.

Britney Spears will spill the beans about her upcoming Vegas spectacular tomorrow, TMZ has learned -- and the announcement itself will be an extravaganza in the middle of nowhere.

We're told Britney will unveil plans for her big new Planet Hollywood show from an undisclosed location in the Mojave desert at around 4AM PT, and it will be broadcast live on "GMA."

It's going to be huge -- 1,350 participants will be bused from Vegas to the desert. And get this ... all attendees must be between 5' and 6' tall ... we don't know why.

As for Brit ... she'll be arriving via helicopter.

All told, we've learned the show announcing the show will cost roughly $100,000 -- including $27,176 to bus all the people (28 buses total), $4,200 for tents, and $5,154 for craft services ... which includes 2,100 bottles of water, coffee, 918 Gatorades, and 567 Red Bulls.

We're told Britney will be performing her new single "Work Bitch," and she'll then blast specifics about her new show that debuts in December. In case you can't wait, we have a bunch of particulars, including what she'll be raking in.

4 AM, huh. Bets on lip-synching anyone?

Shellie Zimmerman says she never really knew the man she was married to for 6 years -- but one thing she knows for sure ... he's selfish to the core.

George Zimmerman's soon-to-be ex-wife appeared on "Good Morning America" Friday and made it clear there's no love lost.

Shellie has filed for divorce. She wants the 2 dogs and a cut of any judgment George gets in his defamation lawsuit against NBC.

As TMZ first reported, she's getting more than $4k a month from the Zimmerman Legal Defense Fund.

Reese Witherspoon said she and her husband exercised "poor judgment" on the night they were both arrested in Atlanta and says an incident like that will "never happen again."

In her first interview since the arrest in Atlanta on April 19, Reese told George Stephanopoulos of "Good Morning America" that she and hubby Jim Toth had "one too many glasses of wine" at dinner and thought they were "fine to drive."

Clearly they weren't ... and Witherspoon was arrested for disorderly conduct after she mouthed off to the police officer who was arresting her husband for DUI.

NBA star Jason Collins -- who instantly became a national symbol as the first openly gay professional athlete currently playing -- says he doesn't know any other gay players in the NBA.

Collins appeared on GMA this morning ... saying he always knew he was gay but fought it hard.

Collins says he was engaged at one point but called it off, because he felt he would be getting married for the wrong reasons -- he felt he was doing it to convince himself that was the life he should lead.

Collins praised the Prez for calling him and voicing support, and also said one of his true heroes is tennis legend Martina Navratilova ... who has been openly gay for years.

She's back!!!!! Robin Roberts returned to her anchor chair on "Good Morning America" on Wednesday ... her first day in her old job since undergoing a bone marrow transplant to treat a blood disorder.

And the best part -- she was greeted with welcome back messages from Barack and Michelle Obama, Oprah and Hillary Clinton!!

With a big ol' smile on her face, Roberts told the audience ... "I have been waiting 174 days to say this: 'Good Morning America.'"

As for the First Family ... Michelle O told Roberts, "Robin, we just want you to know that the whole Obama family, we've been thinking about you and praying for you and rooting for you every step of the way."

Roberts was diagnosed with myelodysplastic syndrome (MDS) last year ... but says she's determined to beat it.

Robin Roberts is returning to "Good Morning America" after a 5-month leave so she could recover from her bone marrow transplant.

Robin has been battling a rare blood disorder -- myelodysplastic syndrome (MDS) -- and has been struggling with the symptoms for a year.

She recently passed the 100-day mark -- an important milestone for bone marrow transplant recipients -- and has been easing her way back into action by showing up at the GMA studio to see how her skin would react to the lights and how she would react to the stress.

Sources close to Robin told us several weeks ago ... she would not be returning until May at the earliest, but apparently her doctors felt her progress exceeded expectations.

Robin Roberts returned to the NYC set of "Good Morning America" this morning -- the first time since undergoing a bone marrow transplant surgery -- for a private "GMA" test run to see if she's physically ready to come back to the show.

Just last week, Roberts explained that she would be doing a series of doctor-approved "dry runs" before officially re-joining the show.

"My doctors want me to see how many people I actually come in contact with," Roberts said ... "How my body reacts to the stimulation, that's code word for stress, of being in the studio environment."

She added, "My skin is very sensitive and so we have to see how it reacts to the studio lights. My vision is still a little blurry from the treatment. All of this is getting better day by day so that is the next step."

Last year, 51-year-old Roberts was diagnosed with MDS -- or myelodysplastic syndrome -- a disease of the blood and bone marrow that was once known as preleukemia.

Robin Roberts will not re-join the "Good Morning America" staff until May at the earliest, and more probably June, 2013 ... TMZ has learned.

Multiple sources connected to the show and the anchor tell TMZ ... Robin's medical issues make an earlier return way too risky, because her immune system is extremely weak.

We're told doctors are pleased with her progress and say she's right on schedule, but that schedule puts her on the bench for 5 or 6 months ... something she's not crazy about but realizes is necessary.

Sources at GMA tell us ... the honchos are hoping that Robin can return as early as February, but we know that's not in the cards.

Lindsay Lohan has triggered a broadcast war, with the folks at "Today" accusing "Good Morning America" of whoring themselves out to score an interview with the actress.

GMA insists they did not agree to all but declare personal questions off limits during Lindsay's interview on Friday ... despite multiple reports to the contrary. And they not-so-obtusely accuse "Today" -- aka the "desperate competitor" -- of leaking the story.

"Today" producers have fired back ... saying the interview was "weak" and they have no one to blame but themselves.

Truth be told ... Rogers and Cowan, Lindsay's P.R. flack, and most other publicists get these shows to limit questions in return for big interviews, even though everyone denies it.

But here's the problem for GMA. They say they did not agree to any conditions and asked the questions they wanted to ask.

Well, the way we see it, that would make them crappy interviewers, because the only personal question they asked Lindsay about was her newly-discovered half-sister. There are a few other questions on the table -- e.g., how do you feel about the fact that you're about to be prosecuted for yet another crime and you'll probably go to jail?