It's Cinco de Mayo, and Ellen is celebrating in style -- you never know what can happen! She loves surprising her audience with amazing gifts and huge prizes, and today is no exception. One lucky audience member will win tickets to "American Idol"! You can also win one of Ellen's biggest prizes if you're playing along with her Yay! May! Sweepstakes! Then, you never know what the beautiful SCARLETT JOHANSSON is doing next. Just a few months ago, she stopped by with an amazing singing performance, now she's in the huge summer movie, "Iron Man 2." She's playing a tough and sexy superhero -- and did all her own stunts! She might even have a few moves to teach Ellen today. Plus, the extraordinary MELISSA ETHERIDGE just released a brand new album and is making a rare talk show stop right here with Ellen! She'll give an unbelievable performance of her hit song, "Fearless Love." Also, Ellen is introducing you to another amazing web star that you've gotta see -- on today's Wonderful Web of Wonderment!