Jenna Dewan is looking back on her sexy collaboration with Christina Aguilera. Dewan, 45, was asked about her favorite memory from filming Aguilera's 2010 music video for her song "Not Myself Tonight" during her Thursday, March 12, appearance on Watch What Happens Live. "That was really funny because I did not know what I was getting myself into," the actress said. "I showed up to film this video, which I thought I was dancing, but I thought it was - I don't know what I was doing.