"The couple are over the moon with the new addition to the family. Friends are already saying that the baby boy looks exactly like Tom.
"They've been laying low over the festive period so they can get used to having a busier household and adjusting to the needs of a newborn," the source added.
Hardy and Charlotte tied the knot four years ago in 2014. They welcomed their first child together in October 2015 but Hardy is also the father to his 10-year-old son Louis, with his former girlfriend Rachael Speed.