Christina Aguilera: Skull & Bones!

Christina Aguilera dons a skull and crossbones tee as she leaves her NYC hotel on Friday afternoon (June 11).

On Wednesday, the 29-year-old “Woohoo” singer celebrated the release of her new album, Bionic, at NYC hotspot Avenue. She wore Stephen Webster jewelry and the rings on her right hand — it spells out “XTINA.” Guests included Kim Kardashian, tennis champ Serena Williams and model Selita Ebanks.