Is Megan Fox expecting a baby?

The 25-year-old actress is said to be expecting her first child with actor husband Brian Austin Green and the couple are thrilled with the happy news.

A source told America's Star magazine: "They just found out and are incredibly excited."

Megan and Brian had kept the news to just close family and friends something they have found difficult because they are so excited about the baby.

The source added: "It's still early, so they are only telling close friends and family members."

The Transformers star has already had lots of parenting practice as she is stepmother to Brian's nine-year-old son Kassius, his child with actress Vanessa Marcil.

The source said: "Megan has become a great stepmom, and Brian knows she'll be wonderful with the baby.

"She has really grown in the past couple of years ... her family comes first."

Megan married Brian in a private ceremony in Hawaii in June 2010.