With Coachella 2011 kicking off today in Indio, CA, there are some huge celebs heading out to the desert for the weekend-long music festival.

Stars like Scarlett Johansson (with beau Sean Penn), Emma Roberts, Zac Efron, Lea Michele, Darren Criss, Busy Phillips, Nicole Richie and more are all reportedly expected at this year's event.

Check out which stars have hit up the music-fest in the past in the gallery above. Chances are, some of them will be there again this year -- and we'll have those new photos up this weekend!

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