Jennifer Aniston and John Mayer may have called it quits.

A source says the pair’s on-again, off-again relationship may have ended sometime within the last week, when Aniston returned from her overseas Marley & Me junket.

“He broke up with her when she got back from her European tour,” the source said.

Aniston’s rep did not immediately comment. Mayer’s rep declined to comment on the singer’s personal life.

But what are their friends saying?

One pal warns that we shouldn’t be quick to assume the two are through for good. As we know, this wouldn’t be the first time they’ve gone their separate ways.

Aniston recently opened up about love and romance to the U.K. magazine You. “Who ever said that every relationship has to last forever? That’s hoping too much,” said Aniston, who turned 40 exactly a month ago. “I think every relationship is a world unto itself.”

As for finding the perfect partner, she said, “I don’t have one and I don’t think it exists.”

Aniston and Mayer went public for the first time at the Oscars at the end of last month. Backstage at the Kodak Theatre, Aniston told Gayle King, who was interviewing them for her pal Oprah’s show, that she was “very happy.” Later in the night, they strolled arm in arm into the Vanity Fair postshow party at the Sunset Tower Hotel.

Most recently, Aniston was spotted on Monday at the same hotel grabbing a bite to eat at the Terrace restaurant. She’ll be jetting to New York City in the spring to shoot The Baster, in which she stars opposite Jason Bateman as an unmarried 40-year-old who decides to have a baby with her best friend.

Mayer, meanwhile, has been in the studio working on a new album.

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Nicole Kidman takes little Sunday Rose to a Nashville Gymboree Play & Music Center Tuesday, March 10th, afternoon where they both played, danced, and sang with the other mothers and kids. As the two left the play center, Kidman looked attentively at a sleepy and over-stimulated Sunday Rose, who resembles her mother more and more each month.

Fame

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Bauer Griffin

Fame

UPDATE: HERE’S THE VIDEO!

Joaquin Phoenix’s bizarre antics continued Wednesday at a hip-hop show in Miami.

Sporting a disheveled dark suit and smoking a cigarette, the scraggly-bearded Phoenix, 34, got on stage around 1:50 a.m. at the Fontainebleau Miami Beach hotel’s nightclub.

Nodding to the music, he was barely audible as he began rapping to a beat played by the DJ.

Near the end of his first number, Phoenix walked to the edge of the right side of the stage and called out an audience member whom he thought was heckling him.

“Bitch,” Phoenix yelled. “This is a $3,000 f—–g suit!”

He then jumped into the crowd as security rushed after him.

It was unclear whether the two men scuffled, but security dragged Phoenix away as the crowd chanted “Joaquin! Joaquin! Joaquin!’”

His brother-in-law, Casey Affleck — who is making a documentary about Phoenix’s career leap from acting to rapping — filmed the entire incident.

Phoenix’s wacky antics — which include a bizarre Feb. 11 Late Show With David Letterman appearance — may be part of an elaborate hoax.

But Paul Dobransky — a relationships expert and author of The Secret Psychology of How We Fall in Love — recently told the Los Angeles Times that Phoenix could also be schizophrenic, pointing to his “socially inappropriate behavior”

His rep denied the claims: “How absolutely inappropriate for a doctor who has no personal interaction or relationship with someone to diagnose them.”

Still, fans can’t get over Phoenix’s unkempt appearance.

A club-goer Wednesday told Usmagazine.com, “He looks like he needs a shower. Is he doing a Geico commercial? He looks like a fancy caveman!”

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Anne Heche and beau James Tupper welcomed their first child together over the weekend, a son named Atlas, a source tells Usmagazine.com.

Heche finalized her divorce from ex Coley Laffoon — the father of her 7-year-old son, Homer — earlier this week. “Homer is very excited to be a big brother,” the source tells Us.

Heche exclusively confirmed she was pregnant to Usmagazine.com in December. “They are thrilled,” her rep told Us then.

She and Tupper first met in 2006 on the set of their short-lived ABC drama Men In Trees (I miss that show!) while Heche was still wed to Laffoon. “In that friendship, we kind of discovered we saw the world in a somewhat similar way,” Tupper, who was also married at the time, told the Vancouver Sun in 2007. “I think we both made decisions that were based on the relationships we were in.”

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