The mark of a great act-chest is her ability to shock with the unexpected. Here are some celebs that fit that bill and will make you leap out of your pants in surprise.
Many actresses have blown their director/star for a role, but few have shown such enthusiasm for doing it on camera as Chloë Sevigny in The Brown Bunny (2003). She made something, Lake Bell in How to Make It in America (2010) leaves her man sleeping in bed and shows off her amazing rack. It took balls for Sharon Stone in Basic Instinct (1992) to show her bush. Pole-dancing and lap-dancing is the best way to get your professor to give you an A, as Eva Amurri Martino in Californication (2007) learns. In our days they called them prostitutes, but Helen Hunt in The Sessions (2012) is a therapist. Whatever, the end result is still a happy ending. Smoking hot Jessica Biel in Powder Blue (2009) pours dripping hot wax on her mamnificent tits. Full-frontal nudity from Michelle Williams, Sarah Silverman and a bevy of nudie cuties in Take This Waltz (2011). We'll save the last dance for our pants. Anne Hathaway in Havoc (2005) puts her tits where our eyes can see them as she simulates orgasm. You won't have to. Elizabeth Berkley in Showgirls (1995) gives the fuck in a pool to end all fucks in a pool. A better gimmick than her brother's black glove, Janet Jackson in Super Bowl 2004 Halftime Ceremonies (2004) loses the part of her wardrobe that covers her chocolate milk sacks. Super hot in only a pair of lacy briefs, Marisa Tomei in Before the Devil Knows You're Dead (2007) is a hell of a girl.
Always expect the unexpected.