Actress Mila Kunis is reportedly expecting her first child with fiance Ashton Kutcher.

"This is something they both wanted. They are both so happy," usmagazine.com quoted a source as saying.

The former "That '70s Show" co-stars first went public with their relationship in 2011 and a month ago, a source had confirmed their engagement.

Another source said Kutcher is "very happy" with the news of Kunis's pregnancy. However, he prefers to be private about his personal life.

"Ashton has been very private and cut off more than he usually is," said a source.