Sometimes songs are inspired by books. Sometimes songs are inspired by other songs. Sometimes songs are inspired by mind-bending, kaleidoscopic, drug-fueled rages.

Other times, though, it just takes a famous person to help an artist pen a song. The quintessential celebrity-inspired tune is Carly Simon's 'You're So Vain.' And even if we don't know for sure who she sang about in that 1972 track, we know it was inspired by someone important to her.

'You're So Vain' aside, we were able to track down the sources of some other hits, though. Check out the photo gallery above for our 16 facts you probably didn't know about songs inspired by celebrities.

And if you have any secrets hidden up your sleeve, share them in the comments below!

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