Justin Trudeau is about to become a father again.   

The federal Liberal leader and his wife, Sophie Grégoire-Trudeau, are expecting their third child.  The couple already have two youngsters: Xavier, 6, and Ella-Grace, 4.   

The new baby is due in March.   

Trudeau's staff was told the happy news on Monday, spokeswoman Mylène Dupéré said.   

Trudeau has taken to Twitter to let the rest of the world in on the big news.   

"Thrilled to let you know we're going to need another seat in our canoe: Sophie is pregnant!" he tweeted, posting a photo of the couple and their two children paddling a canoe.