Olivia Munn & Hayden Panettiere Glam Up 2012 ESPY Awards

As for the appearance, Miss Munn is among those taking the stage as one of the awards show's many presenters, with others including Jessica Biel and Kenny Chesney.

As for tonight's main event, the 2012 ESPY Awards will be hosted by Rob Riggle and will feature a performance from Nas, as well as an exclusive Nicki Bluhm and the Gramblers recorded version of the Queen/David Bowie classic "Under Pressure."

All of the show-stopping moments come as the show airs live tonight starting at 9/8c on ESPN.