If she were on the front there wouldn't be any room for a pillion passenger!...as it is the guy on the front is only just visible...and there only appears to be one helmet between them!
I can't see what's she's holding onto but I hope for his sake he doesn't have to brake too hard and throw her over the top...he could have a very high-pitched voice afterwards; unless she lands on top of him - then they may think she was riding alone!!
