Bradley Cooper, Ken Jeong, and Ed Helms (Getty Images)
Bradley Cooper, Zach Galifianakis, Ed Helms, and Justin Bartha can skip the Advil — "The Hangover Part III" debuted not in a messy rager, but with maturity and style.

The final chapter in the comedy trilogy, directed by Todd Phillips, held a red carpet premiere Monday in Westwood, California, welcoming the original cast and famous supporters. While the stunning box office success of its sequel might add pressure to the forthcoming Memorial Day weekend opening, filmmakers and ticket holders laughed throughout the screening and into an after-party constructed on a nearby open lot.

The misbehaving men of the film wind up back in Las Vegas for their last onscreen outing, so the bash went with a Caesar's Palace theme complete with performers posing as Roman statues and the casino's famous marquee looming over guests.

Robert Pattinson takes his dogs and hits the road (X17Online.com) Affairs of the heart aren't easy, especially in Hollywood. Just ask Robert Pattinson.

While rumors started circulating over the weekend that he and longtime girlfriend Kristen Stewart have called it quits again (last summer, anyone?), photos of the "Cosmopolis" star engaged in manual labor would definitely suggest he's no longer living with his former "Twilight" co-star.

Though this particular couple often keeps us guessing, we can't help but notice some rather overt and dramatic clues in pictures snapped of Rob leaving Stewart's home in Los Feliz, California. Here are a few dead giveaways that Pattinson has probably packed up for good ...

Custody of the dogs. Bear and Bernie, the rescue pups that are often photographed with one or both of the stars, rode shotgun with Rob as his pickup pulled away from Stewart's house in photos taken by X17 Online. It's a country song waiting to happen: the quiet canine solidarity as he drives a pickup full of his things through the streets of Los Angeles. Speaking of which ...

Seriously, what's with that pickup truck? We'd never dare to criticize Pattinson and Stewart's casual sense of style. Flannels, jeans, and baseball caps are fine with us when you're trying to remain anonymous! But in a town like L.A., Pattinson's beat up red truck sticks out like a sore thumb. Trust us, there are easier ways to

Jennifer Lawrence sported a total of four different outfits for her first day at the Cannes Film Festival. “The Hunger Games" star wore head-to-toe Christian Dior for the "Catching Fire" photo call and then changed into a black-and-white Christian Dior gown and Jimmy Choo sandals for the "Jimmy P" premiere. Then it was more Dior as the starlet slipped into a strapless white Dior dress for the beachside party at the Baoli Club celebrating her movie. But once she stepped inside the bash, Lawrence changed into a a sleeveless gray frock with sheer panels. Watch the vid to see more of the hottest Cannes fashion, and for the latest entertainment news check out “omg! Insider” on TV.

Christian Bale debuted a dramatic new 'do on Sunday when he arrived at Los Angeles International Airport from New York with his wife, Sibi Blazic, and their 8-year-old daughter, Emmeline. The 39-year-old actor sported a casual ensemble of green cargo pants, a black button-down shirt, and sunglasses. But it was his bald head and reddish beard that had us doing double takes. Christian's bare-headed look is a serious departure from the super-sexy Bruce Wayne we all know and love!

The Hollywood hunk is notorious for dramatically altering his appearance for movie roles, so we have to wonder if his bald 'do is correlated with his most recent role in the David O'Russell-directed drama "American Hustle." "The Dark Knight Rises" actor has been photographed rocking a major make under complete with a bad comb-over while filming the flick in New York. But this recent look isn't the only mega-transformation Bale's undergone for a major movie role.

Check out the vid to see Christian's newest 'do and to see what other drastic physical changes he has made for a role in the past!

Taylor Swift (WireImage)Justin Bieber (WireImage)

Taylor Swift made it clear on Sunday night at the Billboard Music Awards that she is not a "Jelena" fan.

First, there was the awesome video that captured Swift sticking her tongue out in disgust after she spotted her BFF Selena Gomez attempting to lock lips with her maybe on-again beau Justin Bieber. (Sadly, he turned his head and she only got some cheek action.) Now, there is more footage of the "22" singer hinting at the fact that she's definitely not a Belieber.

Brad Pitt (Esquire)Brad Pitt (Esquire)When you're part of a Hollywood power couple like Brad Pitt and Angelina Jolie, it's hard to know who you can trust, which is probably why Brangelina keeps their circle tight.

"I have very few friends," Pitt reveals in a new Esquire magazine interview.

(Zillow)

(WireImage)

Michael C. Hall is moving.

As the Showtime series "Dexter" prepares to air its eighth and final season in June, its 42-year-old star has plunked down $3.825 million for a six-bedroom, six-bathroom home in L.A.'s trendy Los Feliz neighborhood, Zillow reports.

Hall's new residence has more space than his former home in the Hollywood Hills, which he sold for $1.83 million in August. In addition, the restored 1923 Spanish colonial-style residence features breathtaking views of grassy hills and downtown L.A., a large swimming pool in the backyard, an upscale kitchen with stainless steel appliances, a media room, and guest house — all the essentials for a celebrity home.

Everyone knows women in Hollywood are scrutinized when it comes to their physiques, but according to Vin Diesel, it's even worse for men.

In the latest issue of Men's Fitness, the "Fast and Furious 6" star opens up about body image and says, "Hollywood is more concerned about male actors being in shape than its female actors."

While Diesel is known for his his buff bod, and probably has landed many roles thanks to his muscles, the actor notes that being one of the fittest men in showbiz also has its limitations. "Being a physical presence will rule you out of a lot of roles," he tells the magazine. "I couldn't have done [a movie like] 'Ferris Bueller's Day Off' with that physical presence."

Honestly, we couldn't imagine Vin without his brawn, but it makes us wonder how Hollywood's leading ladies feel about his bold statement.

Check out this vid to see which iconic actor Diesel feels would be super buff if he was still alive, and be sure to tune in to "omg! Insider" on TV tonight for all the latest in entertainment news.