Everywhere he looks, Dave Coulier can always count on John Stamos . Days after the Full House alum shared that he was diagnosed with stage 3 Non-Hodgkin's lymphoma , John was there to help his former costar embrace the next step of his cancer journey: shaving his head. And of course, Uncle Jesse even said goodbye to his own famous locks—well, sort of.

"Nothing like throwing on a bald cap and flexing some Photoshop skills to show some love and solidarity with my bro @dcoulier," John shared to Instagram Nov. 18 , alongside photos of shaving Dave's head. "You're handling this with so much strength and positivity—it's inspiring.

" The 61-year-old added, "I know you're going to get through this, and I'm proud to stand with you every step of the way. I love you." John also gave a special shoutout to Dave's wife of four years Melissa Coulier , writing that she "is the most wonderfulest—your true life line!" John and Dave have had an incredibly close relationship since they starred on the hit '90s sitcom, with John showing his support for Dave after he shared his diagnosis.

"My brother from day 1," he wrote on Instagram Nov. 13, alongside a photo carousel of the two over the years. "Love you @dcoulier and I'll be by your side through it all.

" Dave previously explained that his cancer battle has been a fast and furious one, as he learned about the development in his lymph nodes just five weeks prior to sharing the news publicly. "In that time, I've had three surgeries, I've had c.