Jennifer Lawrence shades a mystery Hollywood actress during 'Watch What Happens Live' appearance

You can always count on Watch What Happens Live! to give us some dirt.

Jennifer Lawrence appeared on the Bravo show on Monday, and got candid alongside her BFF, Laura Simpson. The 26-year-old actress was game to play "Shush Your BFF Lush", when she was asked to reveal the meanest thing she's ever said about a celebrity without actually naming the person. The two hilariously shared that they have a few creative nicknames for certain stars.

"There's somebody that we ... there's a lot of nicknames for certain celebrities," Simpson said. "The Lady, there's Pickle ..."

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See photos of Jennifer Lawrence through the years:

"Well, the Lady has different variations...the Raging Lady, the Lady in Red, the Lady in Waiting ..." Lawrence added, dishing that her and her friends all dislike the unnamed celeb.

However, Lawrence was much less forthcoming about her love life. The Passengers star is reportedly dating 47-year-old director Darren Aronofsky, but when host Andy Cohen asked if she had a boyfriend, Lawrence coyly blew bubbles into her drink.

Later, the avid reality TV fan had some fun with a game of Plead the Fifth, in which she revealed which Real Housewife she would want to be stuck in space with.

"As much as I love Lisa Vanderpump, I think Kyle Richards," Lawrence mused. "I feel like we would balance each other out a little bit better -- a purely survival choice."

See photos of Andy Cohen:

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One celeb we know Lawrence adores is her Passengers co-star Chris Pratt's wife, Anna Faris. ET spoke to the close trio at the film's Los Angeles premiere last week, when Faris hilariously admitted she was on Lawrence's side when it comes to her epic prank war with Pratt.

"I fully support Jennifer Lawrence," the Mom star admitted. "I am all for it. I adore her!"

"I can't believe you're Team Jen," Pratt responded. "I need some support, I thought you'd back me up!"

Watch the hilarious interview below: