Reality TV star Kourtney Kardashian, who posed nude during her first pregnancy in 2009, says she was imitating her mother Kris Jenner, who had done so in the past.

People.com reports that Kourtney posted her own photograph alongside her mother's on Instagram, captioning it: "I got it from my mama."

The 35-year-old was expecting son Mason, in 2009, when her nude photograph was clicked. She now has a daughter, Penelope, and is now expecting her third child with boyfriend Scott Disick.

Her mother's photograph is from 1987, when she was pregnant with son Rob. She posted the picture to her blog in 2012 in honour of Rob's 25th birthday.