Who's that girl?! We have no idea! But Leonardo DiCaprio definitely picked her up off the side of the road on Tuesday morning after partying the night away with Justin Bieber on Monday night. We didn't the two were friends but it looks like JB is the newest member of Leo's infamous "P*ssy Posse."

Driving his Mercedes-Benz, Leo picked up the mystery brunette after living it up at 1Oak with Justin Bieber the night before. The babe was decked out in all black and got into the back seat, as Leo's bud was in the passenger seat.

Does anyone see a casual double team in this chick's future?

Mother Monster is prepping for her big day!

Lady gaga casually puffed on a cigarette as she scouted wedding locations in Malibu on Tuesday, and the singer was shockingly understated in wide leg pants and a striped top. Maybe now that she's going to be a Mrs. she's decided to tone down her wacky image?

The songstress was checking out the swanky West Beach Club, but it doesn't really make much sense to us why she was touring the venue as the potential site for her nuptials, because she recently bought a home nearby. Guess she doesn't want a backyard bash!

A source told X17online:

"Gaga was very relaxed and happy during the outing. She was asking lots of questions, like how late she could play music and where she could put a dance floor. It seems like she's intent on having a fun, playful ceremony with lots of guests."

Her huge engagement ring from fiancé Taylor Kinney was practically blinding in the sunlight, as was Gagaloo's peroxide hair. The "Applause" hit maker hasn't got every detail figured out yet, but she has asked her collaborator Tony Bennett to sing at the grand affair, and he accepted with pleasure. This will undoubtedly be the hottest invite in town!

Zayn Malik has just quit One Direction -- EVERYTHING IS TERRIBLE! HOW WILL WE GO ON?!

Honestly we here at X17 probably know two 1D songs between all of us, so we think we will somehow recover, but there's sure to be wailing and gnashing of teenybopper teeth as this news of the boybander's exit hits the Internet.

The 22-year-old shocked the world when he pulled a John Lennon and took his final curtain call with the five-member group on Wednesday. The rest of 1D, Niall Horan, Harry Styles, Liam Payne and Louis Tomlinson, will continue as a quartet. BTW: In case you (because you are an adult human) don't know which one Zayn is -- he's the really skinny one who brown hair who isn't Harry Styles.

The Brit released a statement to the Daily Mail in which he thanks the band:

My life with One Direction has been more than I could ever have imagined. But, after five years, I feel like it is now the right time for me to leave the band. I'd like to apologise to the fans if I've let anyone down, but I have to do what feels right in my heart. I am leaving because I want to be a normal 22 year old who is able to relax and have some private time out of the spotlight. I know I have four friends for life in Louis, Liam, Harry and Niall. I know they will continue to be the best band in the world. (sic)"

Recently Zayn's personal life has come under scrutiny with accusations of an eating disorder and a drug addiction -- so we aren't totally surprised that he's parting ways with the boys.

Judging from the overwhelming outcries on Twitter since the shocking news broke mere minutes ago -- every social media platform is about to be brought to its knees.

Zayn Malik -- we know you had to Stevie Nicks it on out of there and go your own way, but just know that today, you made the Internet cry.

Did Gwyneth Paltrow pull a Lady Gaga and forget to put on pants?

It may look like it, but Gwynnie just wore some seriously short jorts (aka jean shorts for those of you not in the know) to run some errands on Tuesday.

The leggy lady raised some eyebrows when she wore a button down, cardigan and those not-so appropriate shorts. The 42-year-old was dressed more like a teenager than a mother of two as she hopped around Los Angeles.

Despite thinking this ensemble is a bit too revealing, we gotta say that her legs look amazing! Take that Taylor Swift!

Look at those abs!

Amal Clooney grabbed some cocktails with friends at the Monkey Bar in NYC last night, and the sexy barrister donned some funky patterned pants and a fuzzy crop top that exposed her perfectly toned midriff. No wonder husband George is smitten!

We have to say, though, that as much as we obsessed over her Venice wedding weekend looks, we're not so sure we're loving the styles that she's been rocking lately. Anna Wintour must not agree with us, because the Vogue head hauncho was spotted having lunch with the British beauty yesterday at the swanky Lambs Club in Midtown, Page Six reports. Perhaps they were discussing putting Amal on the cover of the fashion bible? After all, why else would she be meeting with fashion's most powerful woman?

Talk about a meteoric rise to fame!

In the wake of Angelina Jolie's admission that she had her ovaries and fallopian tubes removed, Kelly Osbourne is coming out in support of the Oscar winner's dramatic decision, even adding that she too has thought about it herself.

“I actually do have the cancer gene,” the 30-year-old said while stopping by mom Sharon Osbourne’s talk show, The Talk. “My mom made all of us get tested after she found out that she had it and got her double mastectomy.”

While on the show, Osbourne said she backed Brad Pitt's wife's choice. “I agree with this 100 percent … I know that one day I will eventually have to do it too because if I have children, I want to be there to bring them up. I want to be there to support them in every way I can.”

The former E! host also added, “It’s something I applaud Angelina for because she’s bringing attention to this. People are now going to go out and get tested for it.” 

On Tuesday, Jolie revealed her choice, which sent her into menopause, in an an op-ed piece for The New York Times. The actress said she had her ovaries and fallopian tubes removed after her doctor found inflammatory markers in her blood test, often an early sign of ovarian cancer. Jolie's own mother, Marcheline died of ovarian cancer in 2007, and has taken extreme measures to ensure she does not die in the same way, leaving her six children motherless.

He's trying to keep a hot bod to keep his lady!

Patrick Schwarzenegger hit the gym in L.A. yesterday after spending the night at girlfriend Miley Cyrus' house, and the USC student must be trying to sweat out some of that spring break partying!

Arnold and Maria's son and the pop princess hit up Kiwami in Studio City for dinner on Monday night, so she must not have dumped him for getting handsy with bikini clad girls in Cabo! Not that the "Wrecking Ball" singer is all that pleased with his embarrassing antics, though! "She’s not happy with him,” a source told Us Weekly.

The 21-year-old should know that you can never keep secrets and get away with it in Hollywood. His dad having a baby with the housekeeper should serve as a good reminder to not make mistakes!

Good for him!

Jon Hamm discreetly completed a 30-day stint in rehab for alcohol abuse, TMZ reports. The Mad Men star sought treatment at Silver Hill Hospital in New Canaan, Connecticut.

His timing was quite perfect, as he left the center just in time for the April 6 premiere of the final season of his hit AMC show, and quietly began his stay after he had wrapped filming all the episodes.

"With the support of his longtime partner Jennifer Westfeldt, Jon Hamm recently completed treatment for his struggle with alcohol addiction. They have asked for privacy and sensitivity going forward," his rep said in a statement to Us Weekly.

Although he has never spoken publicly about his addiction, rumors surfaced in 2011 when The Enquirer ran a news story exposing his troubling behavior. "On the set, Jon’s always as sober as a preacher. But when he’s not working, he likes to cut loose with a drink or two… or more! By the end of night, he often seems blotto. His nickname is 'Hammered'," a source dished to the mag.

We hope Don Draper got the help he needed!