I agree with Nuttkase I would take Selena over Vanessa, but it's close.
Plus with Selena you get the added bonus of Justin bieber making diss tracks at you. I think dude is still under 18 but it would be lulzy to have one of the little homies put mittens on him at an awards show.
This my friends could also be a full length feature film. I would want to be played by Vince Vaugn and obviously Selena could play herself.
Justin Bieber would be played by Andy Milonakis.