Whittle / Kaminski / Splash News
Although the duo was feeling camera shy when they left the bash (Demi hid her face in a giant, plush nipple), it was another story when they were inside the party.
"They were both incredibly festive and upbeat," an insider tells E! News. "They danced the night away."
And guess which celeb was moonlighting as DJ at the star-studded soiree?