Brooklyn Decker lands 'SI' cover; Lil Wayne heads to jail

After first pointing to a fake billboard of a naked Sen. Scott Brown (a reference to his old Cosmo spread), David Letterman unveiled the real Sports Illustrated billboard in Times Square last night showing Brooklyn Decker, wife of tennis star Andy Roddick as the new cover girl. ... Also last night, Letterman's famous stage manager Biff Henderson wound up going to the hospital when he hurt his knee catching a football thrown by Dave before quarterback Drew Brees came on. ...

Today: Lil Wayne is expected to surrender in New York to begin a one-year jail sentence on gun charges. ... Ellen DeGeneres joins American Idol, just in timefor the Hollywood rounds. ... And The Jay Leno Show says farewell. ...

Last night, Leno said that it was great reconnecting with Dave for that Super Bowl ad. "In fact, the commercial went so well," Leno continued, "Dave and I have decided to go to Vancouver and compete in the two-man luge."

Elsewhere: Simon Cowell may have a new girlfriend named Mezhgan Hussainy. ... Looks like George Clooney has shaved off his beard. ... Did you know Gabourey Sidibe's mom sings three times a week in the New York subway?