Clad in a denim vest and carrying a pink Chanel clutch, the 31-year-old reality star teamed the unflattering bottoms with black boots.
Kim is clearly trying to stick to a healthy exercise regime, buying a Babolat tennis racquet with her mother Kris Jenner at a sports store.
Kim and her 'kurves': Kim Kardashian was going for casual comfort, but her leggings hugged her in all the wrong ways on Saturday in Calabasas
Not her best look: Kim sported knee high black boots and a denim waistcoat with the unflattering trousersThe proud aunt also posted a picture on her Twitter page showing her playing tennis on the court holding her nephew Mason, who looked adorable in his sunglasses.
She looked to be embracing her sporty side with her retro headband and low-cut, black tennis outfit. Her caption read, 'Mason wanted to play tennis too!'
In an interview with Extra last Friday, Kim said that her two-year-old nephew is the love of her life and she is not currently dating, following her split from Kris Humphries.
Leggings lady: Kim appeared curvier than normal while entering Stanley's restaurant with her BFF Jonathan Cheban and a female friend on Saturday
Mother and me time: Kim was seen today doing some shopping at Net Results in Calabasas, California
Fender bender: Kris Jenner's car was hit by a civilian in Calabasas on Saturday
'Obviously, I've learned that I rush into things when I fall in love and get excited,' she told Extra.
'I need to take my time, so maybe I should chill out for a little bit and not date - it's the only thing I can do at this point. Whenever it happens, it'll just happens. I'm not worried about it, I'm not looking.'
After buying her racquet, Kim's mother Kris Jenner's car was accidentally pranged in the parking lot.
Unfazed, Kim headed to lunch at Stanleys restaurant with her best friend Jonathan Cheban and a female friend.
On to the shops: The reality star donned a pair of racy bondage-style heels and skinny jeans later as she she headed out for a spot of retail therapy in Beverly Hills
It was reported earlier this year that Kim will appear in a multi-episode arc in the show, playing Nikki, who is a love interest for Ben Feldman's alter-ego Fred.
Kim has already appeared on shows including 90210, How I Met Your Mother and, most recently, Last Man Standing.
Proud aunt: Right after buying a Babolat tennis racquet, Kim posted a picture of herself on Twitter putting it to use and wrote, 'Mason wanted to play tennis too!'
Strolling along: Kourtney Kardashian and Mason joined Kris Jenner on a shopping trip in Calabasas