Double Date? Ashlee & Vincent Party with Liam & Miley in L.A.

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11/18/2011 AT 6:00 AM ET

Ashlee Simpson made it a cozy date night with beau Vincent Piazza at a Google and T-Mobile bash inside L.A.’s Mr. Brainwash Studios. And they weren’t the only couple sticking together: Miley Cyrus and on-again boyfriend Liam Hemsworth showed off their moves on the dance floor as Maroon 5 serenaded the starry crowd (guests included everyone from Cory Monteith to Paris Hilton to Chris Brown – with hits like “This Love.” As for Simpson and her man, a partygoer tells us they were huddled together in a VIP section where they “hugged up and [acted] very sweet with each other.” – Jessica Herndon


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