Heidi Montag is Pepsi Perky

The Hills’ feminist hero Heidi Montag rocks out a floor-grazing Stella McCartney gown at RADAR Entertainment’s Pepsi 500 “Running Wide Open” event on Wednesday in Los Angeles.

The 21-year-old aspiring singer accessorized with an oversized pink Prada clutch and Louboutin shoes. The Pepsi event was hosted by super producer Pharrell and NASCAR driver Jeff Gordon , who raced remote control car crosses against each other at Avalon Hollywood.

20+ pictures inside of Pepsi perky Heidi Montag…