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

鈥淥n this beautiful Mother鈥檚 Day evening鈥 Welcome little Aiden to our family and to the world!鈥 the actor shared on Instagram as the celebratory day came to a close. 鈥淎rielle, you鈥檙e the most amazing mother and I love you both so much!#happymothersday #forever #weeAiden #Arielle #newlife鈥

McKidd, who has played Dr. Owen Hunt on Grey鈥檚 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. 鈥嬧滱rielle and I are so happy to announce our marriage and new baby, who is soon to join our growing family,鈥 he wrote in a post on his website. The nuptials took place in Malibu, California, with friends, family and, of course, McKidd鈥檚 Grey鈥檚聽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 鈥渉appy for us too and are looking forward to the arrival of their newest sibling.鈥 Congrats to the growing family!

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

(photo via Jamie McCarthy/Getty Images)