Kristen Stewart showed off more than she intended when she wore a black bra under a sheer tank top when she walked her new dog on Sunday.

Stewart was taking her new black puppy for a walk near her Los Feliz home in Los Angeles home on July 28 and wore her usual tomboy ensemble. She suffered wardrobe malfunction, however, when she paired her black bra under a sheer purple tank top with armholes that were cut so low it almost reached her waist. She accessorized the look with her signature baseball cap turned backwards, eyeglasses and Vans sneakers.

View photos of Kristen Stewart's wardrobe malfunction with her exposed cleavage here.

Enstars previously reported that the 23-year-old sexed up her tomboy look during a stroll with a friend in Glendale, Calif. with a sheer t-shirt a week after she wowed the fashion crowd during Paris Fashion Week earlier this month. Stewart tied her white tank top into a knot at her waist, which showed off her slim frame. However, thanks to the black bra she chose, she still suffered a wardrobe malfunction as the sheer fabric revealed her bra underneath and it also peeked out on the sides.

View Kristen Stewart's previous wardrobe malfunction with her sheer t-shirt photos here.

Stewart was photographed wearing a sexy tomboy look the day before her former pal Katy Perry revealed that she told the Twilight actress that she did not date Robert Pattinson after she split with him in May. Perry revealed the tale in the September issue of ELLE UK magazine.

Perry told the magazine, "I sent her a text message saying, 'I know you've seen all this stuff but you know I would never disrespect you. I'm not that person,'" she said in the interview. "I'm just trying to be a friend to him but it is unfortunate that I do have a set of t*ts.'"

Perry was responding to reports that Stewart felt "betrayed" by the Firework singer. Entertainmentwise reported that a friend of Stewart's told Grazia she was "never fully comfortable with Rob and Katy's relationship."

"She always suspected he had a soft spot for her," the source reportedly told the publication. "She's furious that the pair seem to have got together without so much as a word to her."

Perry and Pattinson's outings following the breakup allegedly made Stewart "paranoid that something could have gone on before she split with Rob," the source said.

A source, however, told E! Online at the time that "nothing is going on between Rob and Katy."

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