Christina Applegate stopped by Watch What Happens Live on Sunday and played a risky game of Plead the Fifth. After revealing whether or not she's ever "swam in the lady pond," Christina pled the fifth when asked which of her former costars has the biggest bulge. But things took an awkward turn when Andy Cohen asked the Vacation star about the 1989 MTV Movie Awards, where she ditched her then-boyfriend Brad Pitt midshow for another guy. "Who was the guy you ditched Brad Pitt for?" Andy asks. Christina gets visibly nervous and says, "How many fifths do I get?" She then gave a little more away by answering a series of questions about the guy through sealed lips. Watch the clip above, then check out Scott Eastwood dropping a major bombshell about Ashton Kutcher's marriage during his appearance on the show.