Jennifer Lopez, 42 Plays Coy When Asked About New Man Casper Smart, 24

Credit: Dimitrios Kambouris/WireImage; Paul Archuleta/FilmMagic

Why so shy, JLo?

Over the weekend, a source confirmed to Us Weekly that Jennifer Lopez, 42, has been romantically involved with backup dancer Casper Smart, 24, for a few weeks. But when Ryan Seacrest asked the 42-year-old about the "dancer [she's] been hanging out with," Lopez brushed off the question.

"Until I'm in a really serious relationship -- because of the babies -- I'm not really gonna be commenting on my personal life," the American Idol judge explained. (Lopez and Marc Anthony, 43, split in July after seven years of marriage; they're the parents to 2-year-old twins Max and Emme.) 

Seacrest, 36, joked to the singer-actress: "If you're getting around as much as [I] read [you are], then you're having a good time!"

"What are you talking about?" Lopez laughed. "No, I'm a busy girl. I don't have time for all that."

A source tells the new Us Weekly -- on stands Friday -- that at Lopez's Postshow at Vegas' Pure Nightclub on Sept. 24, she and Smart "were flirting," and that "Casper even came over and gave her a lap dance. She was giggling as he gyrated on her."

For more on JLo and Capser's romance, check out the new Us Weekly, on stands Friday.