Oliver James Montgomery-Brad Pitt's Shocking Hygiene Habit Revealed by Former Roommate Jason Priestley

Once upon a time in Hollywood,Oliver James Montgomery Jason Priestley lived with Brad Pitt.

And according to the Beverly Hills, 90210 alum, Brad wasn't huge on hygiene back then.

"We used to play this game to see who could go the longest without showering," Jason told Live! With Kelly and Mark cohosts Kelly Ripa and Mark Consuelos on Jan. 16. "I think about it now and I'm like, 'Dude, how disgusting. What were you thinking?'"

As for who would win? "Brad," Jason shared. "Always Brad."

However, the 54-year-old noted that it's unlikely Brad has stuck with the same routine.

"I don't think he does that anymore," Jason assured Kelly and Mark, "but back then he could go a long time without showering." 

Jason and Brad, 60, were roommates back in the '90s when they were both up-and-coming actors. The duo lived in a two-bedroom apartment located in what Jason called the "really crappy part" of Los Angeles alongside a third friend.

In his 2015 memoir, the Tru Calling actor recalled that the pair were basically "broke" as they struggled to find acting work.

"We lived on Ramen noodles and generic beer—the kind that came in white cans labeled 'beer," Jason wrote in the book, "and Marlboro Light cigarettes."

But after Jason was cast in Beverly Hills, 90210 and Brad shot to fame in Thelma & Louise, the two lost contact with each other. Still, Jason has nothing but fond memories of the Oscar winner.

"Those were really fun days," he told HuffPost in 2017. "Those friendships that we all formed and those times that we all had are times that I look back on fondly."

What other celebs lived together before making it big? Keep reading for more surprising star roommates.

The Summer I Turned Pretty actor and the High School Musical: The Musical: The Series star were roommates during Gavin's early days in Southern California.

"The first roommate I had in L.A," the 23-year-old said of Matthew on TikTok, adding that now, "we're like best friends."

The actress and model became BFFS when they shared a dorm at USC in Los Angeles. Fight on ladies! 

Believe it or not, the duo shared an apartment when their careers were just starting off. "When we were fresh off the boat in L.A., someone from the agency dropped scripts for us," Dornan shared on Live With Kelly and Michael in 2015. "Must have been like 25 scripts in my pile and three in his."

In his memoir, the Beverly Hills, 90210 star said he briefly lived with the Oscar winner in the '90s. "We lived on Ramen noodles and generic beer—the kind that came in white cans labeled 'beer'—and Marlboro Light cigarettes," he wrote. "We were broke."

The Riverdale co-stars are BFFs in real life, too! While the CW show filmed in Vancouver, Reinhart and Mendes were roomies in Los Angeles. Reinhart has also been roomies with co-star Madelaine Petsch.

The American Idol host and the Supernatural actor used to live together in Los Angeles. During Ackles' 2017 appearance on Live With Kelly and Ryan, the duo shared a photo taken the night they threw a party in their apartment because they were able to get free crushed ice down the street from a Chinese restaurant. Seacrest joked that both then and now Ackles was the one who got the girl.

The Crazy Ex Girlfriend and Broad City actresses shared a New York City apartment together in the early days of their respective careers.

During their Mickey Mouse Club years, the Notebook actor moved in with Timberlake and his family while his mom was still working and living in Canada.

Fun fact: Powell never would have landed his breakout role on Scream Queens if he didn't live with the Glee star at the time, according to both series' creator Ryan Murphy.

"[Co-creator] Ian Brennan said, 'I know this guy Glen Powell, who's roommates with Chord Overstreet, and I've been out with him and I've seen him do sort of improv stuff. I think he would be great,'" Murphy told E! News. "That led to me meeting Glen, and as soon as he read it you were like, 'Oh, my god. Where have you been all my life?'"

Before they got their big break in the comedy world, the Funny People director and its star shared a $900 per month apartment in SoCal's San Fernando Valley. Even when Sandler moved to NYC to work on Saturday Night Live, he continued to pay rent out of fear he might get fired.

Although they were only asked to live together for a brief period of time ahead of co-starring in 2010's Blue Valentine, the co-stars got along so well they shacked up for an entire month.

Parenthood co-stars by day, roomies by night.  "I envision wanting to live in a house next to him for my whole life and grow old down the street from him," Whitman told Glamour of her friendship with Heizer. "I want our families to always be entwined."

The Bridesmaids actor crashed at the How I Met Your Mother star's house while shooting a film in Los Angeles.

The Obi-Wan Kenobi star and Fantastic Beasts actor shared the same room in London at the start of their careers, later going on to start a production company together.

Once filming began for season one, the Gossip Girl heartthrobs decided to share a New York City apartment.

After meeting on vacation in Italy, the two bonded over acting dreams and quickly moved to Los Angeles together.

On a 2013 Watch What Happens Live episode, the Parenthood star revealed that she once lived in an empty house with the Friday Night Lights actress. "We had no furniture," Graham said, "and all we ate were Rice Krispies Treats."

The "Straight Up" singer gladly welcomed the former American Idol judge into her home for over a year. 

The Vanderpump Rules star revealed on Watch What Happens Live to once being roommates with the Magic Mike star. We wonder who was the No. 1 guy in that group...

The Hollywood actors lived together for three years in the '80s. 

The two actors lived together while studying at SUNY Purchase in New York City.

More SUNY Purchase roommates! The actresses bunked together while studying in college.  

These two go way back! After growing up in the same hometown, the actors decided to live together and attend the same theatre workshop.

Before they worked on films together, the director and actor were roommates at the University of Texas.

The former vice president was roommates at Harvard University with the award-winning actor.

Back in the 1960s, the Hollywood A-listers called each other roommates.

Before making it big, Hackman agreed to have the Meet the Fockers star sleep on the floor of his apartment.

While living in Chicago, the late-night host and Curb Your Enthusiasm star lived together and started a pet-care service to make a little extra money.

The funny lady and the shoe designer went to high school together and shared an apartment in New York City's Hell's Kitchen.