Nick Jonas and John Stamos Friendship Pictures

1 October 2018: John Goes Public With His Love For the Jonas Brothers

After repeatedly being spotted wearing a Jonas Brothers t-shirt, John went public with his love for the Jonas Brothers by wearing one of their band t-shirts to the 2018 American Music Awards.

1 / 6

2 February 2019: Nick Makes His Move

Image Source: Backgrid

Clearly flattered, Nick was seen heading out of JFK airport a few months later wearing — what else? — a tee with John's face on it. Not only that, but the photo on the t-shirt just happened to be of John wearing a Jonas Brothers tee. "It's your move @johnstamos #jonasbrothers #sucker," Nick wrote on Instagram.

2 / 6

3 March 2019: Things Get Serious

Not only did John make his move, but he certainly did not disappoint. Shortly after, the actor posted a photo of himself sleeping with a pillowcase that had a photo of Nick wearing a shirt with his face on it. "I had the craziest dream last night..." John wrote. LOL!

Guess it's your move now, Nick!

3 / 6

4 March 2019: Nick Takes It Up a Notch

Nick didn't let John have the last laugh. The singer decided to print out John's picture on a duvet cover.

4 / 6

5 March 2019: John Declares His Love in Permanent Ink

Just when we thought Nick had won the back-and-forth battle, John delivers this shocker: a tattoo of Nick's face. But now we need to know . . . is it real?!

5 / 6

6 June 2019: John Deems Himself "Uncle Jonas"

Image Source: Getty / Charley Gallay

On June 1, the Fuller House actor introduced the band ahead of their Wango Tango set clad in a Jonas Brothers concert tee and tattoos of Kevin, Joe, and Nick on his arm. He later posed for a picture with the brothers, which he captioned "Uncle Jonas," and Nick couldn't help but bow down to his greatest fan.

6 / 6