New mom Kim Kardashian has signed on to be a brand ambassador for the Atkins diet to help her shed the extra weight she gained while pregnant.

The reality TV star and her husband Kanye West welcomed their second child, son Saint, on 5 December (15), and now Kim is eager to get her pre-baby figure back with the help of the popular weight loss system.

"Teaming up w/ @AtkinsInsider because it works for me!," she wrote on Twitter.com. "So much variety on #Atkins40 and Harvest Trail Bars = YUM."

Kim, who previously used Atkins to lose weight following the birth of daughter North in 2013, reveals she gained 60 pounds (27 kilograms) while pregnant with Saint.

She lost 17 pounds (7.7 kilograms) by mid-December through breastfeeding and dieting.