Britney Spears rocked rainbow hair on the Vegas stage at the iHeartRadio Music Festival! Does the blonde bombshell’s fierce fashion statement beat out Miley Cyrus’ faux hawk? How about Demi Lovato’s Barbie-girl blonde bangs?

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Britney looked fabulous as always alongside iHeartRadio host Ryan Seacrest. Miley was escorted on stage by Olympic hottie Ryan Lochte and his blingin’ grill as they announced Lil Wayne’s performance. Demi came out to support fellow iHeartRadio Music Festival performers and smiled pretty in pics backstage.

The iHeartRadio Music Festival Returns To Las Vegas [AUDIO]

Which star’s crazy hairdo stole your heart at the iHeartRadio Music Festival?