Actor John Stamos went back to his Elvis-loving, Uncle Jesse ways to celebrate his son’s first birthday on Instagram.

As Dearly previously reported, Stamos knew he always wanted to be a father, but never got the chance until he was 54 years old.

That’s when his wife of one year, Caitlin McHugh Stamos, gave birth to their first child together, a son named Billy.

And ever since Billy’s birth, Stamos has excitedly assumed the role of doting dad and often posts the most adorable photos and videos of Billy on his social media.

Including Billy giggling in his father’s arms:

And the two of them gardening together:

View this post on Instagram

Sowing the seedlings of love.

A post shared by John Stamos (@johnstamos) on

Most recently, the father of one shared a photo of himself and Billy in matching Elvis costumes in celebration of his first birthday.

Billy even gave it his best attempt at matching Stamos’ facial expression.

He captioned the photo:

One year ago tonight, our little King was born.

Many of his former Full House co-stars all had something to say about Stamos and his “little King.” Candace Cameron Bure wrote:

Happy birthday Billy!!!! What a great pic

Bob Saget added:

Please lemme@your Teddy Bear…. ?

Dave Coulier commented:

Mr. Toots! Love you

Billy’s mom even added:

? for my darling, i love you, and i always will ?

Caitlyn also added a post of her own in celebration of their son’s birthday.

She wrote:

Happiest of birthdays to my one year old son! I am so grateful to be your mama.

Happy First Birthday, Billy Stamos.

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