(Cover) - EN Showbiz - Jennifer Lopez is "very cool" to work with according to her co-star Rodrigo Santoro.

The pair star together in upcoming movie What to Expect When You're Expecting.

And the Brazilian actor told E! Online that the American Idol judge was a pleasure to be on set with.

"Jennifer was really great," he told the site. "She was very cool."

"She was really generous. She's incredibly professional and helped me a lot because I think she's got this natural talent for comedy. She is fun!"

And it certainly helped that the mother-of-two is "gorgeous," Rodrigo added.

The twosome play a couple trying to adopt a baby in the adaptation of the best-selling pregnancy guidebook.

The ensemble cast also includes Cameron Diaz, Elizabeth Banks and Brooklyn Decker. (C) Cover Media