Avril Lavigne has attempted to explain the Blender cover to MTV News:
Even if she's not topless, the 22-year-old is still flaunting her inner bad girl. "The Blender shoot was really fun because it was super rock and roll — we had a bottle of [whiskey] and ate cupcakes," she said. "Everyone was super cool. It was definitely a different kind of photo shoot for me."
So, it only looks like she's lame enough to whack her tits out for Maxim. That's, erm, alright then.
And there were cupcakes there. Evidently she was the lead cupcake.