Pregnant reality TV star Kim Kardashian believes pregnancy has altered her idea of sexiness and now she feels there are "different versions of being sexy".

The 32-year-old "Keeping Up with the Kardashians' star is expecting her first child with rapper boyfriend Kanye West, reported a website.

"I've tried to stick to what I'd usually wear but you obviously have to change it a little bit. You try things you think will work, but they don't always work! Anything stretchy works.

"So long as you feel good in something, you'll feel sexy, too. I think there are different versions of sexy," Kardashian said.

Kardashian has been criticized for her choices of maternity wear during her pregnancy. Actress Jamie-Lynn Sigler came to Kardashian's defence as she recently said that it is "hard" being pregnant.

"There's overly sexy, where you're showing off and it's, like, short and tight. Then there's sophisticated and sexy; and then there's effortless and sexy, not showing any skin. You can wear a turtleneck and have that be super-sexy. I guess it depends on what sexiness is to you," Sigler said.