Christina Aguilera is swinging a hip after hours with the massive curves out and the leather pants all tight. The 40-year-old superstar singer, fresh from going shirtless in leather for Valentine's Day, was back to her favorite trusty fabric on Thursday night, and it was body-ody-ody for the "Stripped" songstress' 7.4 million Instagram followers. Xtina, who has been recording new music in Miami, kept her fans on their toes with this one. She even appeared to have no words. Check it out below.