He played the hilariously awful boyfriend in Ellen's favorite film of last year, "Bridesmaids," and his hit show "Mad Men" is about to make a dramatic and much-anticipated return! JON HAMM has been busy! Since he was last here, he hosted "Saturday Night Live" and appeared in some of the funniest sketches of the season! Plus, the handsome and hilarious MICHAEL WEATHERLY drops by Ellen for the very first time! He's telling her about the amazing 9th season of his hit show, "NCIS"! Then, her single "Love Song" shot her to stardom, and SARA BAREILLES has been on top ever since! Now she's a judge on NBC's "The Sing-Off," and she's here to perform "Let the Rain" from her most recent CD, "Kaleidoscope Heart."