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.Read Mila Kunis and Ashton Kutcher will like to marry soonAnother 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.In spite of rumours that the couple is having twins, Kunis is expecting only one baby with Kutcher.In an earlier interview, Mila Kunis had said that she is happy and has found that being in love is wonderful.The 29-year-old actress told Italian magazine Io Donna that she won’t answer their question about Kutcher but admitted that love is great, the Daily Express reported.