Teen Choice Awards host Katy Perry and her ex, former Gym Class Heroes singer Travis McCoy, both performed at the fan-voted honors last night - but based on a new track on Katy's album - things may be a little awkward between the two ex-lovebirds.In yet another magazine cover story, Katy tells Billboard magazine that "Circle in the Drain" is her version of Alanis Morissette's "You Oughta Know" - but instead of Dave Coulier, Katy unloads on...