Khloe Kardashian is waving the white flag -- finally giving up any hope of salvaging her marriage to Lamar Odom ... and it's all because of his shirtless rap session. Is it time to walk? Plus, Britney Spears' ex-husband ... Kevin Federline is cranking out babies at record pace. He's got #6 on the way -- with 3 different mothers -- and he's only 35! Congratulations or ... enough already? And, Vice President Biden reveals his Christmas gift-giving tradition with President Obama -- we'll tell you how our one-of-a-kind photographer manages some candid bro-talk with one of the most protected people on Earth.