It was a Mother’s Day that Kevin McKidd will never forget! The Grey’s Anatomy star announced Sunday that he and wife Arielle Goldrath are the proud new parents of a baby boy.

“On this beautiful Mother’s Day evening… Welcome little Aiden to our family and to the world!” the actor shared on Instagram as the celebratory day came to a close. “Arielle, you’re the most amazing mother and I love you both so much!#happymothersday #forever #weeAiden #Arielle #newlife”

McKidd, who has played Dr. Owen Hunt on Grey’s since season 5 in 2008, shared the news alongside a sweet black-and-white close-up of Goldrath snuggling little Aiden.

The actor first revealed that he and Goldrath were expecting back in March, making the surprise announcement alongside the bonus bit of good news that they had gotten married. ​”Arielle and I are so happy to announce our marriage and new baby, who is soon to join our growing family,” he wrote in a post on his website. The nuptials took place in Malibu, California, with friends, family and, of course, McKidd’s Grey’s costars.

Baby Aiden joins big siblings Joseph, 17, and Iona, 15, whom McKidd shares with his ex-wife, Jane Parker. When he announced their good news in March, he said that both children were “happy for us too and are looking forward to the arrival of their newest sibling.” Congrats to the growing family!

What do you think of the name Aiden? Let us know @BritandCo!

(photo via Jamie McCarthy/Getty Images)