It's only been four months since Kim Kardashian have birth to North, but the new mom looks sexy in a new photoshoot with her famous sisters, shot by celebrity photographer, Terry Richardson. 

The Keeping Up With The Kardashians reality stars--Kim, Khloe and Kourtney posed for a new spread for their forthcoming Lipsy Line. The sisters all looked lovely modeling a vast range of dresses, jackers and jumpsuits for the British brand. The clothing line launches on Oct. 24 at Lispy stories in the United Kingdom, Ireland, the Middle East, the Netherlands, and Russia and online at Lipsy.co.uk. (See the entire spread here:)

Kim looks greats and flaunts her post-baby body in a tight red dress, paired with nude pumps. From the looks if--Kanye West's baby mama has dropped most of her baby weight without intense workouts, but with the help of Atkins Diet. 

"I haven't exercised a whole lot so far, just because I've been busy wight he baby and I don't want to leave her," she revealed in a recent interview with London's Sunday Times Style supplement. 

Kim, who turned 33-year-old on Monday revealed that she dresses up for her man. 

"You want your guy to think you're really hot. I'll put something on and he'll [Kanye] say, 'No, that doesn't look good', and I'll trust him,'" she says of the rapper and designer, 36.

As far as how being a mom has influenced her style, she admits that she wants to dress up in clothes that are much "lighter."

"I think North looks cute in light colors, and then I want to wear light colors," she reasons. "North doesn't typically wear pink, though. She wears mauve or blush, not, like, typical baby pink."

Tags: Kim Kardashian Post Baby Body