This is supposedly Lady Gaga and Britney Spears backstage at Brit’s Vegas show

I say supposedly because that looks NOTHING like Britney Spears.  Perhaps it’s the stage makeup mixed with bad lighting in the room mixed with an amateur photographer using a smartphone (photo via Gaga’s Twitter, btw)?  I actually think it looks a little like actress Sarah Chalke (from Scrubs and Roseanne).  Thoughts?