David Spade hilariously explains why Ellen wasn’t invited to his birthday party and gets a jaw-dropping surprise. Then, 6-year-old genius Matthew Sawchuck amazes with his astronomy knowledge, and Tommy Lee discusses college life at 42 and more!

From one of Ellen's favorite television shows, "House," HUGH LAURIE drops by to talk about the show's exciting new season. Plus, the Rock Star himself, TOMMY LEE visits with Ellen to talk about his hit show "Rock Star: Supernova" and which contestant he thinks will be the best fit for his new band, "Supernova."