The 25-year-old actress is said to be expecting her first child with husband Brian Austin Green and the pair are thrilled with the happy news.
A source told America's Star magazine: "They just found out and are incredibly excited."
Megan and Brian, 38, 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."
Megan has already had lots of parenting practise 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."
It has to be mentioned that Megan and Brian married in June 2010 at the Four Seasons Resort in Hawaii.They first met in 2004 on the set of Hope & Faith. They became engaged two years later but broke things off in early 2009.The couple became engaged again in June the following year and promptly married.
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