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.

As Dave Coulier continues to go through cancer treatment, he is getting some support from his friend John Stamos.

John Stamos showed love to his “brother” Dave Coulier on Instagram Wednesday after Coulier, 65, announced 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.