Ashlee Simpson, Vincent Piazza
Credit: Roger Wong/

Ashlee Simpson and Vincent Piazza celebrated Valentine's Day at New York City's Dream Downtown Hotel, where the couple checked out a performance from Band of Horses at Rag & Bone's Fashion: Take Note party. Simpson wore a sparkly black dress and a striped clutch for her date night, while Piazza bundled up in a camel coat and striped tie. See more stars at last night's hottest parties in the gallery!