Kim Kardashian (Reuters files)

Reality TV star Kim Kardashian is desperate to end her marriage to basketball star Kris Humphries as she prepares to start a family with Kanye West.

The pregnant beauty is locked in a divorce battle with the sportsman, who she wed in August 2011 before calling off the union 72 days later.

Kardashian admits she wants to be legally single, telling U.S. radio show Sway in the Morning, "In a perfect world, of course I would love to be divorced. (The marriage) is going on its second year, and that's really tough because I want to move on. I really want to move on with my life."

Kardashian also brushed off critics who have blasted her for conceiving a baby with West while married to someone else.

She insists, "If anyone knew all the fertility problems and the things that I was going through. God brings you things at a time when you least expect it. I'm such a planner and this was just meant to be. What am I going to? Wait years to get a divorce? I'd love one. It's a process."

The mother-to-be has learned to have a sense of humour about her short-lived relationship with Humphries, but adds, "I just don't like all the jokes. Things (lasting) 'longer than Kim's marriage'. Technically I'm still married, so that joke doesn't really work… Give it up, people!"