On Halloween, John Stamos stopped by “Jimmy Kimmel Live!” to promote his new Lifetime show, “You.”

But fans were also treated to a surprise appearance by Stamos’ 6-month-old son, Billy.

During Stamos’ interview, the bouncing baby boy was brought to the stage by the actor’s wife, Caitlin McHugh.

Stamos and the 32-year-old model tied the knot in February 2018, two months after revealing they were expecting their first child together, according to Us Weekly.

The wedding was officiated by Mike Love from the Beach Boys, Stamos confirmed on the show, which could be why the actor decided to dress up as a member of the popular band for Halloween.

Billy was dressed as a miniature version of Mork, from the show “Mork & Mindy.”

And his dad couldn’t stop gushing over him. Stamos bounced his baby and gave him kisses throughout the interview.

The baby didn’t seem at all rattled by the lights and cameras while he was in his loving dad’s arms. Stamos told Kimmel:

“I’m so in love.”

However, when Kimmel asked if the couple is trying for another child, Stamos once again said that Billy makes it difficult for them to even try.

The dad joked that his son is a “c-block,” just like he did on “Live! With Kelly and Ryan” last month. He told Kimmel:

“He’s kind of a c-block, cramping my style when I try to have sex.”

Regardless, fans on social media couldn’t get over the father and son’s loving relationship. One Facebook commenter wrote:

John is SO over the moon for his son!! Very happy for him!!

Fans were also happy to see the tot because Stamos doesn’t often show close-ups of Billy’s face on social media, so it was their first time getting a good look at the growing baby boy.

No word yet if the dad plans to take his boy on any more television appearances.

Watch the interview below:

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