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I’ve waiting my whole life to write that sentence. For her film role in The Town with Ben Affleck, Blake Lively is looking trashtastic in a skimpy little outfit and a little one perched on one hip.

The Gossip Girl star is a long way from 5th Avenue and her Manhattan socialite alter ego in a tiny denim miniskirt and tank top. Topping off her look is a black leather belt and chain. Not exactly Serena van der Woodsen’s style, but she rocks it nonetheless.

Meanwhile, Ben is looking quite fab in a simple pair of black jeans and vintage-style t-shirt. Not bad. Not bad at all.

Gallery Info: Blake Lively films a backyard BBQ scene on the set of her upcoming film with Ben Affleck, The Town, in Boston, Massachusetts on August 31, 2009.