Kim Kardashian is keeping mum about the sex of her unborn baby.

The 34-year-old reality star addressed rumors about her pregnancy amid reports her second child is a boy.

Kardashian revealed she and husband Kanye West are expecting following the mid-season finale of "Keeping Up with the Kardashians" on May 31.

"So many rumors...we are not having twins, yes I am carrying my own baby lol & we have not told anyone the sex of our baby yet!" she cleared up Wednesday on Twitter. "Nothing is confirmed unless you hear it from me!"

Kardashian and West are already parents to daughter North, who will turn three June 15. Sources told Us Weekly the couple are having a boy, saying, "Kanye loves Nori more than anything, but to make his world complete he wanted a little boy, an heir. He's overjoyed!"

Kardashian and West have been together since 2012, and married in Florence, Italy in May 2014.

The reality star rented out the Staples Center in Los Angeles this week to celebrate her husband's 38th birthday with such celebrities as Justin Bieber, John Legend and Tyga.