Tony Romo's been all over the place this week: on Jimmy Kimmel Live, in that what-the Super Bowl video and, last night, on the Late Show With David Letterman. Well, actually, Romo wasn't on Late Show -- he was just the topic of conversation. The Richardson native was ostensibly visiting Letterman to chat up The Price of Beauty, which debuts Monday on VH1, but the host was more interested in her relationship with the Cowboys QB ... not to mention John Mayer, who gave her that nickname that's clearly going to stick.