The 28-year-old Iraq war vet met González-Jones when he was casted for a role in the soap opera All My Children.
"We found out just last week it's a girl and we are over the moon," Martínez tells People 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."
Starting the season as the least known member of the "Dancing With the Stars" cast, Martínez endeared himself to America as the show progressed and the turned-soap opera star took home the top prize.
"Dancing" drew 18 million viewers a week who got a firsthand look at the Iraq war veteran with the infectious positive attitude.
Martínez was severely burned over more than 40 percent of his body when the Humvee he was driving for the U.S. Army struck a land mine. He underwent numerous surgeries over years of recovery but that didn't stop him from taking home the trophy. Martínez danced like that had happened to somebody else.
Martínez has been chosen as grand marshal of the 123rd annual Tournament of Roses parade. He was on the cover of People magazine and named one of its "sexiest men" a few weeks later. And on Tuesday, he became the new "Dancing With the Stars" champion.
The actor and motivational speaker is known for radiating joy and next spring he'll have another member of the Martínez family to share that with.
Contains reporting by the Associated Press.