I'm gonna do what Master Eddie did at the No-Gi Worlds and call BULLSHIT! An appropriate "bullshit" call. Just like he did. That's a dude. Less focus on the ass and more focus on the hands. I'm gonna say that's Eddie in his girlfriend's yoga pants. I'm on the other side of the continent and I can tell that shit!
You've definitely been doing some squats! Nice ass. If you can confidently wear those pants...then wear them. Who's the dude behind you, sporting wood, taking the picture(with your iPhone)?