"We found out just last week it's a girl and we are over the moon," Martinez told the magazine. "Diana has a little baby bump now and it's the cutest thing ever. With the holidays coming up, this is the biggest and best gift we could get."
Martinez, 28, met Gonzalez-Jones in 2008 on the set of his soap All My Children. The two began dating last year.
"2011 has been full of a lot of surprises and opportunities and ultimately, a lot of blessings," Martinez added. "Diana and I were just asking ourselves, 'How is 2012 going to top 2011?' Well, we have our answer!"