The Oscar nominated actor, who plays Ceasar Flickerman in The Hunger Games franchise, revealed the news while talking to press at the Mario Batali Foundation Dinner in New York on Sunday, October 19.
This will be the couple's first child together, however it will be Tucci's fourth child. The 53-year-old actor was previously married to Kathryn Tucci, with whom he had three children. Kathryn passed away in 2009 after battling breast cancer.
In 2011, Tucci was introduced to Felicity, a literary agent, by his The Devil Wears Prada co-star and Felicity's sister, Emily Blunt. The two were married in the summer of 2012.
"I'm very excited to be a dad. It's incredible," Tucci told Us Weekly. "I'm most excited to have a baby with Felicity and for the baby to be healthy."
Congratulations to the happy couple!
Tucci and Blunt are among a number of celebs who have recently announced that they are expecting. Blake Lively recently talked to ET about the difficulty of getting red carpet ready when you're sporting a growing baby bump.