Taylor Swift, Carly Simon Surprise Fans With 'Vain' Duo

Lara Spencer explains what has people buzzing on the "GMA" Pop News Heat Index.
2:31 | 07/29/13

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Transcript for Taylor Swift, Carly Simon Surprise Fans With 'Vain' Duo
Has the show been going on while I've -- "pop news" while you enjoyed your popeye's. Thank you. Long before our friend taylor swift was writing songs about ex-boyfriends, carly simon was doing it with that iconic hit "you're so vain." The two music superstars surprised fans with a rousing duet of the classic and we have the exclusive world premiere of the video for you. ♪ And you're so vain you probably think this song is about you you're so vain ♪ ♪ you're so vain. You think this song is about you don't you don't you don't you ♪ that is a great, great moment. That's cool you know, carly has never confirmed it. It's long been suspected that she wrote "you're so vain" about one-time boyfriend warren beatty. Taylor never tells who her songs about. There's one "dear john." Not so hard to figure out. To see the full clip of a special moment go to goodmorningamerica.Com on yahoo! And love that song. A paige piece of movie history going on the block, the von trapp children's curtain clothes from one of my favorite movies of all time "the sound of music." Julie andrews' character stitches the outfits are to the k kids. They are expected to sell for over a million dollars and another major do re mi. Did you hear one about the zebra who mates with the donkey, oy. Not a bad joke, it's real and really adorable. Take a look. Workers at the animal reserve in florence, italy, where the zonkey is born. The two were determined to be together. Little ippo as they're calling her fine. Not only is the -- oh, well, this is not the only zonkey out there and also call them zedonks here. The zedonks sounds like a problem. One in georgia. Both are doing fine as josh likes to say, everybody is just fine. You have set the bar so high for "pop news." Thank you. That was a good one. Out of the gate strong. What a monday.

This transcript has been automatically generated and may not be 100% accurate.

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