Andy Cohen dug deep into Christina Applegate's past Sunday.

The host of Bravo's Watch What Happens Live asked the star of Warner Bros. Vacation to play "Plead the Fifth," but to his chagrin, she wasn't as forthcoming as he had hoped. To start, Cohen told the 43-year-old movie star, "When your Sweetest Thing co-star Cameron Diaz was on Watch What Happens Live, she admitted to swimming in the lady pond. Tell us: Have you ever taken a dip in the lady pond?"

"Oh! That means gone lesbian for a moment. Uh, no," Applegate said. Not wanting to offend anyone, she added, "Not that that wouldn't be beautiful. Women are beautiful. Just not my cup of lady pond."

Next, Cohen noted that Applegate's Vacation co-star Chris Hemsworth has a big "bulge" in the R-rated comedy. "Who is the most well-endowed co-star that you think you have worked opposite?" he asked.

Applegate replied, "I have to plead the fifth on that one."

"Good choice," fellow guest Mark Consuelos said.

Applegate, who is married to Martyn LeNoble, then pointed to her wedding ring.

"Very good! That's a married lady," Cohen said. "She has respect, people!"

Cohen's third and final question struck a nerve.

"I have read your research extensively. There's much talk of a date that you were on with Brad Pitt to the MTV Movie Awards in 1989 in which you reported that you ditched, mid-date...You said you ditched him for another guy. My question for you, Christina, is who was the guy that you ditched Brad Pitt for?"

Applegate asked, "How many fifths do I get?"

"You had your fifth," Cohen said. "Was he well known?" Still, she didn't want to name the man. "I have to say it? I don't have to do nothin'. I don't have to do anything," she said. "I don't have to do nothin'."

Consuelos joked, "She got all trailer park on you!"

Applegate, who is friends with Pitt's ex-wife, Jennifer Aniston, was tight-lipped. Cohen continued to pry, asking, "Was he an actor?...Was he known to the public?...Was he someone that you eventually wound up dating?...Did you ever see Brad Pitt again after that?...Did you ever date Brad Pitt again after that?"

To see if Applegate answered, watch the clip above.

(E! and Bravo are both members of the NBCUniversal family.)

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