The 23-year-old singer was joined at the event by her longtime boyfriend Wilmer Valderrama.
Nick Jonas, who Demi is about to start a tour with, was also seen in attendance at the annual party.
FYI: Demi is wearing a Dolce&Gabbana dress and clutch, Christian Louboutin shoes, and Neil Lane jewelry. Nick is wearing Emporio Armani.
20+ pictures inside of Demi Lovato and Wilmer Valderrama at the Oscar party… More Here! »