Evan Rachel Wood and Jamie Bell are expecting their first child.
The True Blood actress - who tied the knot with Billy Elliot actor in October 2012 - denied she was pregnant just two months ago but Evan has admitted she didn't know she was expecting at the time.
She tweeted: "Remember when i said, 'No baby on the way here' Well, I didnt know there actually was...
"Thanks for all your warm wishes. We are very happy. I'm gonna be a mama!
"Song of the day "Sweet child of mine" #gunsandroses (sic)."
Wood (25) and Bell (26) started dating after meeting on the set of Green Day's video Wake Me Up When September Ends in 2005 before splitting in 2006 and then reconciling in the summer of 2011.
They then married in an intimate ceremony in California in October and took to Twitter shortly after they exchanged vows to share their marital bliss.
Wood announced to her followers: "Words cannot describe the happiness i am feeling. Overwhelming.
"Thanks for all the congratulations! Many thanks to you wonderful people. :) (sic)"
Bell tweeted: "Thank you for all the congratulations. I'm a very lucky man."