“They are thrilled and can’t wait to meet the latest addition to their family," a source said. "Both boys are excited about being big brothers.”
The baby is due in January.
Even though Will is known for his humor, he recently admitted his sons haven’t inherited his funny gene.
"No, they're not funny," Will said. "They're deadly serious."
Since Will is no stranger to parenting, he has previously given out advice to his celebrity friends.
When his ‘Bewitched’ co-star Nicole Kidman gave birth to daughter Sunday Rose last July, he jokingly suggested that she talk to her new daughter "at least once a week".
"For me, I would advise to talk to your children, at least once a week," he said. "If you've got time, do it two or three times a week. But otherwise, I find the times where I let weeks and weeks go by without talking to my children, that adds up."