The starlet showed off her slender physique in an edgy emerald dress from Cushnie et Ochs that featured double thigh-high splits. Poker-straight hair, nude Nicholas Kirkwood pumps and turquoise Neil Lane earrings topped off the look.
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Selena, who recently split with Justin Bieber, was nominated for six awards at the ceremony – Choice Female Artist, Choice Summer Music Star, Best Female, Choice Single, Female Artist, Choice Break-Up Song, Choice Smile and Choice Female Hottie.
Joining Selena on the red carpet was newly single Lily Collins, who looked amazing in a Fausto Puglisi skirt and Hougthon shirt. Her Brian Atwood shoes capped off the quirky look.
Chloe Moretz injected a dose of colour into the proceedings with her multi-coloured bandage dress and Kerry Washington flaunted her toned legs in a Stella McCartney long sleeve mini dress and Christian Louboutin heels.
Miley Cyrus skipped the red carpet but was on hand to accept three awards – Choice Style Icon, Choice Summer Song and Choice TV Scene Stealer: Female. The star had gone for biker chic, showing off her endless pins in a leather skirt featuring a line of buckles. She paired the tough number with a sheer shirt and black bra.
Also rocking an edgy look was X Factor judge Demi Lovato. She wore black leather trousers, a beaded black blazer and white t-shirt. She wore her hair in a quiff.
Demi walked away with three awards, winning Choice Female Artist, Choice Single by a Female Artist and Choice TV Personality: Female.
"Thank you guys so much for the Teen Choice Awards!!!! Love you all sooooo much!!!" she later tweeted.
Sandra Bullock also chose to skip the red carpet, arriving in a dark green minidress to accept the gongs for Choice Summer Movie Star: Female for her role in film The Heat and Choice Movie Chemistry for her scenes alongside co-star Melissa McCartney in the same movie.