Kim Kardashian has already shed 70 pounds since giving birth to her daughter North West in June. The 33-year-old reality star has flaunted her toned figure in racy Instagram pictures and form-fitting outfits but a source told In Touch magazine that Kardashian is desperate to lose even more weight.

"She admitted she's barely eaten a carb for nearly four months," a source told the magazine. "Kim wants to be thinner than her pre-baby body and is willing to do anything to get there. She's desperate to be a size 0 bride."

The source claims the "Keeping Up With the Kardashians" star counts calories every day and only eats grilled fish, steamed vegetables and chicken.

"She works out every day at 5 a.m." her best friend Jonathan Cheban told In Touch adding that Kardashian hits the gym for three hours every day.

She is also doing the Atkins diet to her stay slim. According to In Touch the wedding is a big motivator for the new mom but she also wants to be taken seriously in the fashion world.

"Kanye's been talking to [Vogue editor in chief] Anna Wintour about having the wedding appear in the magazine," the source claims.

According to a report by the New York's Post Page Six, West and Wintour were spotted having lunch together on Jan. 10. A source told Page Six that West was trying to convince Wintour that his fiancé deserves to be on the cover.

"They were in a corner booth, very intense," the source said. "He was talking nonstop. She did not get a word in edgewise."

Reportedly he feels the fashion magazine is the only publication that is "worthy to photograph their baby North West."

In November, Radar Online ran a story claiming that West wanted Kardashian to appear on the cover in her wedding dress but Wintour didn't like the idea.

"Kanye is absolutely determined to convince Anna that Kim should appear on the cover of Vogue wearing her wedding dress. Anna has remained typically aloof to Kanye's constant advances and offers," the source said.