It's a very exciting day! Today Ellen's third book, "Seriously... I'm Kidding," hits bookshelves -- and she's celebrating all day long with some of her favorite people!

The bubbly and hilarious KELLIE PICKLER will be here! You never know what will happen when Kellie's here. She's interviewed people on the red carpet and sat on Clint Eastwood's lap. Whatever she's doing, it's always must-see TV. She'll also be performing her hit new song, "Tough."

Then, the star of the hit show "Community," JOEL McHALE will be here to make Ellen laugh and tell us about the exciting new season of his hysterical show. Ellen's having a party this Tuesday, and you're invited!