Jay Leno and Conan O'BrienThe late-night wars flourished Thursday night on NBC between Jay Leno and Conan O'Brien.

During his monologue on 'The Jay Leno Show,' Jay made a few jokes at NBC and Conan's expense, E! Online reports.

"In other TV news, Sarah Palin has signed with Fox News to be a correspondent. Fox says, if she does a good job, they'll sign her to a long-term contract. And if it doesn't work out, they'll just blame Leno," he quipped.

"With all the controversy going on here at NBC, actually, 'The Tonight Show With Conan O'Brien's' ratings have gone up. So, you're welcome!" Jay added.

Meanwhile, Conan didn't back down.