For Rich Kids of Beverly Hills reality stars Dorothy Wang and Morgan Stewart, any exercise counts -- especially power shopping! In a clip from the E! show's January 19 premiere, the socialites -- both the Wang and Stewart families are multimillionaires -- can't help but sweat during a hardcore retail therapy session on Beverly Hills' luxe Rodeo Drive.

"Walking from Barneys up Rodeo is always our cardio," admits Wang in a preview from Sunday's episode, as Stewart laments that she's so wiped out she's trying to avoid the puddle of "boob sweat" forming under her dress. (For good measure, Wang assures her pal that her breasts look "great" regardless.) "It takes a lot of coordination and tact to be a shopper on Rodeo -- and a power shopper at that, which we are."

As the girls shop, a text from a New York City-based friend prompts Wang to stop in her tracks and take a selfie to send back as a hello. Posing into Wang's Hello Kitty-covered iPhone, the duo immediately stress over how their hair looks and hope their makeup isn't smudged. As the clip above suggests, while they may have perfected the art of shopping til they drop, their selfie-taking skills could use a little lift. "My arms aren't long enough for a selfie," Wang whines before her taller pal Stewart takes the phone to hold.

Later, as they review their image, Wang isn't impressed. "Do I look this bitchy in real life?" she asks a speechless Stewart, who costars on the series alongside boyfriend Brendan Fitzpatrick, Roxy Sowlaty and Jonny Drubel.

Watch more of the girls' Rodeo Drive shopping trip and selfie session before Rich Kids of Beverly Hills premieres Sunday, Jan. 19 at 10 p.m. (EST) on E!. A second episode will air on a special night, Monday, Jan. 19 at 10 p.m. (EST).