Not one, but two of the biggest teen idols on Earth are here! ZAC EFRON and TAYLOR SWIFT are sitting down for their only appearance together, and it's in our studio! They're the stars of the new Dr. Seuss film, "The Lorax." She's the country girl with the unstoppable music career, he's the heartthrob on the cover of every magazine -- they're a Hollywood dream team, and the only place you'll see them together is on Ellen! Then, Ellen has a surprise that's the biggest in Ellen Show history! It's the most incredible gift she's ever given! She's never done this before! Don't miss it.