Lea Michele and Matthew Morrison are former flames! 

Though the "Glee" costars have denied romance rumors in the past, Michele finally copped to dating Morrison in an excerpt from her new book, "Brunette Ambition."

"When we shot the [Glee] pilot, I met Cory Monteith, Kevin McHale, Amber Riley and Chris Colfer for the first time," the actress wrote. "I had worked on Broadway with Jenna Ushkowitz and Matthew Morrison before. Matt had been a friend of mine for years, and in fact we'd actually dated back in the day for a Broadway beat."

The brunette beauty dished about her romance with her costar during an appearance on "Watch What Happens Live."

Andy Cohen asked the "Cannonball" singer how Morrison is in bed, so did she answer honestly or did she "Plead the Fifth?" Watch the clip above to find out!

Not only did Michele admit to her off-screen relationship with Morrison, but she also threw shade at "Real Housewives of New York's" Aviva Drescher.

When asked what she thought of RHONY's current season, Lea made it known that she's not too fond of the reality star.

"I love the New York housewives. Carole [Radziwill] is a very good friend of mine," the 27-year-old said. "I just told you [Andy Cohen] that we went out the other night and had the greatest time. So team Carole 100 percent."

"I don't know what I would do if I ever saw Aviva," she continued. "She would have to turn the other way." 

Watch out, Aviva!

Check out the clip below to see what else she said about the housewives, and click "Launch Gallery" above to see more surprising celebrity couples. 

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