The "Toxic" singer posted a completely nude photo on her Instagram account late on Sunday night to help ring in the upcoming week. In the black and white snap, Brit is covering her ladybits with one arm and with the other, she seductively has her hand placed near her face. Spears isn't wearing anything in the photo except several necklaces. She also clearly has a glam application of makeup. While the photo seems to be from an old photo shoot, it's impossible to tell what Britney was trying to convey here -- other than she's percent sexy.