Cameron Diaz  and Alex Rodriguez were spotted in Las Vegas on NYE, shopping at the new Cosmopolitan hotel where Jay-Z and Coldplay performed  to a star-studded crowd later that night. Cameron and ARod didn't stick around to watch Beyoncé and Jay-Z's duet of "Young Forever," instead heading over to the Aria Hotel for a low-key dinner for two. On Saturday, they were back in LA grabbing lunch at Jerry's Deli before catching a flight bound for NYC. Cameron's racked up the frequent flier miles over the past few months circling the globe to join ARod in Miami  and Mexico  after wrapping her European Green Hornet promotional tour . She'll be all over promoting that movie for the next couple of weeks before its Jan. 14 release, and perhaps we'll see more of Cameron's toned bikini body  if she visits her man in Florida when Spring training starts.