The Coachella music festival was in full swing this weekend, with tons of celebs getting hippied out in Indio... including Sienna Miller and Kelly Osbourne!

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Do we like these two together? I dunno yet. They always look annoyed, so I guess they have that in common!

Wonder what Kelly wants us to "speak up" about?

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Oh, and Kimberly Stewart was there, too... not to mention Jared Leto!

But it wasn't just these young hotties having fun! Click below to see who else showed up...