The "Fuller House" star seems to have gotten some fresh ink of the Jonas brother's face. He shared a picture during the tattooing process on Friday, writing, "#jobrosforlife."
Besides the tattoo artist, he also had a professional camera man by his side so it's safe to say this is most likely a prank.
That doesn't mean Stamos couldn't have a little fun with it, posing as if he was in pain.
Nick and the rest of the Jonas crew thought it was amazing. They commented things like, "No way!!!!" and "Legend."
Bob Saget joined in on the fun too, writing, "Is that my face? Changing my name to Bob Jonas."
Even Stamos' wife got into the action, calling on Nick Jonas to name his firstborn John Stamos.
Stamos and Nick have been going back and forth trying to one up each other for a while now. The singer started it when he wore a John Stamos t-shirt. The actor followed up with a pillow of the Jo Bros. face.
Balls in your court, Nick.