Google's Most Popular Women of 2012
Megan Fox at number 29

Megan Fox and her husband Brian Austin Green are reportedly expecting a baby girl.

The 26-year-old Hollywood actress is said to be four months pregnant with the couple's first child.

Green, 38, already has 10-year-old son Kassius with ex-girlfriend Vanessa Marcil.

Although the couple have yet to confirm the pregnancy, friends said they were excited to learn they will be having a daughter.

A source told America's Star magazine: "She's been helping to raise Brian's 10-year-old son Kassius for years and now she'll have the experience of being mommy to a little girl.

"Obviously, Megan and Brian would be happy with a healthy baby of either gender, but they're beyond thrilled that Kassius is going to have a little sister."

The Transformers star is expected to give birth in the autumn and apparently has no major projects until 2013.

"Megan is attached to a movie called Swindle, but it's in rewrites and probably won't even begin filming until next year. So, right now, her plate is totally clean and she can devote herself to her baby," the source added.