She's beautiful, she's brilliant, she's funny -- and she's the author of a hilarious book! TINA FEY is looking back on her life and sharing it all in her brand new book, "Bossypants," and tells some of the best -- and funniest -- lessons she's learned. Plus, she announces she's expecting her second child!

Last summer, MIKE POSNER went from average college student to famous music star with his hit song, "Cooler Than Me." Now he's here to perform his latest single, "Bow Chicka Wow Wow."