Now that David Letterman and Jay Leno will be going head-to-head once again, the bad blood between the late-night enemies will carry onto the guest couch. Word is Letterman won't play ball with anyone who goes on Leno's 'Tonight Show' first, setting up some serious celeb-snagging competition. More on that, plus Mariah's bubbly stash and Sarandon's bouncy night out with her rumored boy toy after the jump!