Jason Merritt/Getty, Jordan Strauss/Getty
People Staff
September 27, 2011 10:00 AM

In Las Vegas for the iHeartRadio Music Festival, Ryan Seacrest and Julianne Hough had a late-night party at XS, where they arrived 3 a.m. Hough didn’t waste any time – and headed over to the deejay booth and started dancing, while Seacrest watched from their VIP couch in the booth that Usher sat in earlier in the evening.

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