DID MILA KUNIS BREAK UP JUSTIN & JESSICA??? OR WAS IT OLIVIA MUNN???: What ended JUSTIN TIMBERLAKE and JESSICA BIEL'S three-year romance?  Was it MILA KUNIS???  Was it OLIVIA MUNN???

There's been speculation that J.T. and Mila hooked it up while filming - ironically enough - "Friends With Benefits."

There's also been all kinds of talk that J.T. and Munn supposedly, allegedly had a when-we're-in-the-same-city understanding. So did one of them come between Justin and Jessica???

An insider tells People magazine, "No one came between them. They decided their relationship ran its course and it was time to move on." Another source added, "It really was mutual. They're just two people who realized they wanted different things in life and were headed in different directions."

Is one of those 'different things in life' Mila Kunis??? Maybe, now that Justin's a free man. "Justin is very interested in Mila," yet another souces tells People. "They've been flirting, but so far nothing has happened."

In other break up news ... OLIVIA WILDE  has gone ahead and filed for divorce from her Italian prince husband of eight years. Wilde filed papers citing irreconcilable differences and has asked that the court refuse any spousal support for her husband. And check this out: four days before filing, Wilde was spotted sharing brunch and an aquarium outing with RYAN GOSLING!!!

DID LADY GAGA RIP OFF A JAPANESE GIRL GROUP??? WE REPORT, YOU DECIDE: First LADY GAGA'S  "Born This Way" was accused of biting off MADONNA'S "Express Yourself" . . . and now,  a South Korean girl group called SNSD - a.k.a. GIRLS' GENERATION - is accusing her of plagiarizing their work.

Their song is called "Be Happy", and the production team behind "Be Happy", E-TRIBE, says they believe Lady Gaga may have stolen from them. Their rep says "the way the song flows and the arrangements are, honestly, the same. "

Personally, I don't hear any similarities, but I'm no expert. We Report, You Decide ...

"Be Happy" chorus:

""Born This Way" chorus:

SNAPSHOT: SANDRA BULLOCK and baby Louis doing some mommy and me time in NYC over the weekend ...

SHEEN-ANIGANS: ROB LOWE can't replace CHARLIE SHEEN on "Two and a Half Men" because he's committed to NBC's "Parks and Recreation". And now, the OTHER guy whose name keeps getting mentioned is taking his  name out of the mix. JOHN STAMOS said he has no intention of taking the gig.

Quote, "It's really not part of my career plan right now. I'm just on a different trajectory. He added, quote, "I'm ready to have my own show. I don't want to replace anyone, especially Charlie Sheen."

2.) A New York City man got a Sheen-inspired tattoo that just might be the LAMEST TATTOO EVER ...

The as yet unidentified Winner had it inked on his leg.

RELATED: JULIA ROBERTS' Biggest Fan's Tatt Fail

SHEEN LINKS: 1.) Charlie Sheen Death Hoax Spreads Malware Through Facebook. They begin with "RIP!" or "Breaking News" and contain text to the effect that actor Charlie Sheen has died due to cardiac arrest. This article goes into detail.

2.) An obsessed, 26-year-old WINNER who desperately wanted to meet Charlie was arrested for sneaking into his gated community and hopping a fence into his backyard over the weekend. TMZ has the details.

BABY NEWS: VICTORIA BECKHAM is expecting a girl. David says he, Victoria, and their three boys are "over the moon" with excitement. She's due in July.

MAD MEL MAYHEM: As expected, MEL GIBSON pled no contest to misdemeanor battery of his Russian ex-girlfriend Friday. The plea deal allows him to avoid jail time but will require him to attend a domestic violence counseling program for a year and complete 16 hours of community service. He was also hit with a whopping $400 in fines.

Here's some of the courtroom video ...

AND NOW, MICHELLE RODRIGUEZ CLEARS UP A RUMOR ...

SHOW US YOUR TWEETS: KIM KARDASHIAN Tweeted this pic of her with sister KHLOE and EVA LONGORIA from Eva's Twenties-themed birthday party over the weekend ...