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Three-time divorcee Charlie Sheen is hopping back on the marriage wagon ... this time to former adult star Brett Rossi.

Sheen proposed Saturday morning after he flew Rossi to Hawaii on a private jet -- then bragged about the proposal to a local photog who snapped some pics.

Sources close to Sheen confirmed the engagement is for real ... but so far, no additional details.

Sheen was first married in '95 to model Donna Peele but the couple split up a year later. In 2002, Sheen tied the knot with Denise Richards ... but she surprisingly filed for divorce two years later while six months pregnant with their second kid.

Brooke Mueller got the lucky title of wife #3 in 2008 ... but they were divorced in 2011 after a tumultuous relationship.

Miley Cyrus proved she knows how to party in the U.S.A. AND Canada Friday night ... by simulating fake oral sex on stage in Vancouver on a Bill Clinton impersonator.

It was all for the debut concert on Miley's "Bangerz" tour -- which was filled with little people dressed as joints, giant stuffed animals, and a lot of ass -- but the big finish was her rendition of "Party in the U.S.A."

During the song ... Miley's dancers dressed up as famous American icons to pay tribute to our country -- and when Bill hit the stage Cyrus quickly dropped to her knees in his honor.

Might wanna dry clean that blue outfit.

The singles band together for Valentine's Day -- Kylie and Khloe Kardashian lunched with Bruce Jenner near the family home in Calabasas.

Gotta say ... Bruce looks great -- better than he has in a long time.

The 2 sisters showed unity as they left the restaurant.

As you clearly know ... Bruce is separated from Kris ... and Khloe has filed for divorce from Lamar Odom.

Lindsay Lohan spent Valentines day around the love of her life ... alcohol ... and her sister Ali Lohan.

Lilo went bar hopping with Ali Friday night in New York's East Village and both appeared to be date-free. Lindsay and Ali don't look drunk in the photos ... but the night was still young.

Simon Cowell's baby mama better tighten up her lady parts ... 'cause the "X-Factor" judge just landed in New York -- and he's making a beeline for the hospital.

We broke the story ... Lauren Silverman went into labor early Friday morning -- and Simon rushed home from London to be there -- but based on his look in the pic ... the soon to be dad doesn't look too worried about missing things.

Something tells us he won't be filming the gruesome process.

It's official ... Mt. Sean Lowe has erupted -- the ex 'Bachelor' is walking around with a grin that can only mean he finally cleared his pipes by losing his alleged virginity a few weeks after getting married.

Lowe couldn't contain his joy at LAX on Thursday ... exactly 18 days after tying the knot with Catherine Giudici.

The 30-year-old insurance salesman and fitness model claimed he was saving himself for marriage.

So ... 18 days later. Still smiling ear-to-ear? Way to go, Catherine.

Love sucks -- at least for supermodel Alessandra Ambrosio, who stepped out in L.A. Thursday with what appears to be a GIANT HICKEY on her neck.

Alessandra was with her millionaire businessman fiance Jamie Mazur at the time, so it makes sense. Especially since today is Valentine's Day (sorry for the reminder).

GIRL POWER has just taken on a whole new meaning -- former Scary Spice Mel B stripped down to a bikini this weekend in Australia with a bunch of her lady friends ... and things got real frisky, real fast.

38-year-old Mel B and her gal pals sunned themselves on a yacht in Sydney Harbor Sunday. Mel's film producer husband Stephen Belafonte was there too, but her BFFs were the ones getting all the action.

"If you wanna be my lover ... you gotta get with my friends."

Bruce Jenner is NOT changing his identity ... he's just going through a mid-life crisis and is addicted to plastic surgery -- this according to sources close to the Kardashian family and Jenner sons.

Family sources say the klan does not buy what increasingly looks like gender reassignment. They say Bruce is changing his look because of his "Michael Jackson-like obsession with plastic surgery."

They say he is struggling to re-gain his youth. They point to the fact that he's moved to Malibu, grown his hair long and had a ponytail for a long time, drives a Harley, and has changed his nose and neck.

We're told the family has actually counseled him against all the surgery, saying he was a good looking man to begin with, but he wouldn't listen.

They also echo the story TMZ posted Tuesday -- that Bruce is "super manly," the family saying, "He loves sports, helicopters and cars."

It's interesting ... because we also know that when Bruce golfs at the Sherwood Country Club he constantly talks about the '76 Olympics where he won gold. It's also when he was young and great looking, which kind of supports the family's position.

Jennifer Lopez's ass went all "Fatal Attraction" in a tiny pair of tropical shorts ... shouting to the world: "I'm not gonna be ignored."

The 44-year-old mother of two flaunted her endless legs and famous cheeks while filming a music video with Pitbull and Brazilian singer Claudia Leitte in Ft. Lauderdale for the song "We Are One."

Or, in this case ... two.

Bruce Jenner was out and about Monday near L.A. ... with a new, shaved Adam's Apple and a very popular woman's hair style.

Check out the pic ... Bruce got himself an ombre hair coloring where the color reverses the norm. It becomes lighter toward the ends. In other words, it goes from dark at the root to light at the end. It matches Khloe and Kylie's hairdos.

As for the Adam's Apple -- it looks pretty clean ... and smooth.

Sean Penn isn't afraid of a little PDA -- full on grabbing Charlize Theron's ass at a children's petting zoo this weekend ... and kissing her neck like it was the last neck on earth.

Sean and Charlize took the actress's 2-year-old son Jackson to Underwood Family Farms in Moorpark on Sunday -- a pretty couple-y move -- and the baby animals weren't the only ones getting some love.

The 46-year-old actor has been outspoken about the shooting, and his campaign marches on ... Fox will be speaking at a remembrance dinner tonight -- just days after what would have been Martin's 19th birthday.

We're guessing he's happy the Zimmerman fight was 86'd.

Heidi Klum basked in a make-shift banana hammock as she watched her son's soccer practice.

The "America's Got Talent" judge made it typically difficult for soccer dads to focus on the Brentwood, CA field.

Dylan Farrow has fired back at Woody Allen, scoffing at his treatise of innocence and insisting he sexually violated her when she was a kid.

Dylan is clearly incredulous over Allen's claim the sexual molestation allegations were triggered by Mia Farrow's bitterness over his relationship with Soon-Yi.

Dylan told the Hollywood Reporter, "For 20 years, I have never wavered in describing what he did to me. I will carry the memories of surviving these experiences for the rest of my life."

As for Allen's claim he passed a lie detector, Dylan fires back, "In fact he refused to take the test administered by the state police -- he hired someone to administer his own test."

She also notes testimony in the Woody/Mia custody war in 1992 from babysitters who claimed to have witnessed inappropriate sexual behavior by Allen toward her.

As for Woody's claims that shrinks felt it was all made up, she reminds everyone the prosecutor felt there was probable cause to prosecute, but decided against it because Dylan was too fragile.

NBC is already distancing themselves from Jay Leno ... by erasing his name off the side of the building where he shot "The Tonight Show."

The Peacock network sent a team of painters armed with rollers and a forklift to white-out Jay's billboard -- just ONE FRICKIN' DAY after he signed off for good.

Here's what's interesting ... Jimmy Fallon's moving the show to NYC, so the net's not really under a deadline to change the signage before Jimmy takes over the reigns. Guess they just wanted to let Jay know that this "goodbye" is permanent.