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. >>> long before our friend taylor swift was writing songs about ex-boyfriends, carly simon was doingin." well, on saturday night the two music superstars surprised fans at taylor's concert outside boston with a rousing duet of the classic, and we have the exclusive world premiere of the video for you. ♪ clouds in my coffee clouds in my coffee ♪ ♪ and you're so vain you probably think this song is about you you're so vain ♪ ♪ you're so vain. i bet 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. >> and, 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. taking a cue, though, from her, idol, taylor never tells who her songs are about, but there's one song called "dear john." not so hard to figure out. to see the full clip of a really special moment, go to goodmorningamerica.com on yahoo! and love that song. >>> and a piece of major movie history going on the block, the von trapp children's curtain clothes from one of my favorite movies