John Stamos' baby makes his TV debut on Jimmy Kimmel Live! and he is SO ADORABLE

New dad John Stamos brought someone very special along with him during his Jimmy Kimmel Live! visit – his baby boy!

Seven-month-old Billy made his late night TV debut and just like his famous father, seemed completely relaxed in front of the camera.

Dressed up for the show’s Halloween special, Billy laughed, smiled and sucked on his fist while the Full House star blew raspberries on his cheek and chatted to Jimmy Kimmel about his new life as a husband and a dad.

Talk about cuteness overload!

• READ MORE: John Stamos shares the most adorable snap welcoming his newborn baby

"Isn’t he just the most beautiful baby?" John gushed during the interview, "I’m so in love."

John and his wife Caitlin McHugh Stamos welcomed their little bundle of joy in April this year.

In a previous interview with People, the 55-year-old vowed to be a "fun dad".

• READ MORE: John Stamos and Caitlin McHugh have tied the knot!

"I'll be a fun dad. I've been practising for a long time. I've done every schtick you can do with a baby on TV ... all the bits and jokes and diaper gags. I'll probably just do all that stuff," he told the magazine.

And it seems John has definitely been fulfilling that promise so far!