The actress returns to "CSI: Miami" as Horatio Caine's mysterious ex and hosts "Step It Up and Dance."

"CSI: Miami" returns Monday night with part one of a two-part brand-new episode when Julia (ELIZABETH BERKLEY), the woman from from Horatio Caine's (DAVID CARUSO) past -- and the mother of his recently discovered son Kyle (EVAN ELLINGSON) -- has him arrested for murder.

The two were reunited when Julia came under investigation for the murder of her billionaire husband in an episode before the writers strike. This is her second appearance on the hit CBS series, airing Monday nights at 10 p.m.

"David is so passionate about his work. I love that," she tells ET. "[When that happens], you can go places you didn't think you could."

Elizabeth is also the host of "Step it Up and Dance," premiering Thursday, April 3 at 11:00 p.m. on Bravo. The new unscripted series follows 12 very talented dancers as they attempt to learn new styles of dance. The winner will walk away with the $100,000 grand prize.

"One of the reasons that I really wanted to be a part of this show is -- especially in the world of reality television right now where there's this kind of strange democracy of fame, if you will -- what I truly love about this show is it's really about the artistry. It's about working hard, going after your dreams and, I think, it's going to be a great reminder for people of what it really, really takes."

When not performing, Elizabeth conducts self-esteem workshops for school-age girls in an effort to create a safe place for the participants to talk about issues such as body image, self-confidence or health matters. In addition, she has created a Web site, ask-elizabeth.com, to reach out to young women everywhere.