The first image showed the former costars and longtime friends posing — Coulier, 65, with his head shaved, and Stamos wearing a baldcap in solidarity. For the second swipe, Stamos laughed with Coulier while helping him to shave his head. The final photo showed Stamos and Melissa both kissing Coulier's bald head.

John Stamos’ touching tribute to Dave Coulier, battling cancer, highlights the enduring bond between the Full House cast as they show support.

John Stamos showed love to his “brother” Dave Coulier on Instagram Wednesday after Coulier, 65, said that he’s been diagnosed with stage 3 cancer. Stamos, 61, posted a tribute with various photos of the pair over the years, as well as an emotional message to his longtime friend.