She's beautiful, she's brilliant, she's hilarious -- and now TINA FEY is a top author! Tina is looking back on her life and sharing it all in her brand new book, "Bossypants," and will tell some of the best -- and funniest -- lessons she's learned. Plus, she just announced 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."