John Stamos celebrates turning 63 with a thirst trap that has fans saying 'have mercy'

John Stamos is celebrating his birthday with a steamy mirror selfie.

The now 63-year-old "Full House" star took to Instagram to celebrate his birthday with a mirror selfie featuring him in his birthday suit, which he captioned, "63."

Fans went wild in the comments section, with many making references to his character in the popular '90s sitcom, Uncle Jesse.

While his phone blocked his face, the black-and-white photo showed off Stamos' toned abs and gave fans a peek at the tattoo on his left shoulder.

Stamos shared a black and white mirror selfie of him in his birthday suit in celebration of his 63rd birthday. (Christopher Polk/Variety)

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"More like Uncle Yes-se! 😂 Happy Birthday!❤️" one fan wrote, while another added, "HAVE MERCY," which was his character's catchphrase in the show.

Other comments included catchphrases from the show, with one writing, "You Still Got It Dude 😎👍🔥🥵" and another adding, "✂️ it outttttt! 🔥"

Another fan added, "Not John Stamos with the thirst trap 🪤," while his former "Full House" co-star, Candace Cameron Bure also chimed in in the comments section, writing, "Happy birthday Uncle J 🥳."

Stamos debuted the tattoo on his shoulder in March, in an Instagram video showing the tattooing process, with the words, "Guess who got his first tattoo," written across the video.

Stamos debuted his first tattoo in March. (Getty Images)

In the caption, Stamos explained the significance behind the tattoo, which features a Native American horseback rider looking skyward, in his caption.

"The Beach Boys placed this image: ‘Appeal to the Great Spirit’ over Brother Records as a symbol of artistic freedom and trust in a higher creative path," he wrote. "Lately I’ve felt that same pull in my own life. Stepping into this new chapter of my career, taking bigger swings, following the work wherever it leads."

During a recent appearance on "The Bobbycast" podcast, Stamos shared why he has declined to compete on "Dancing with the Stars," despite being asked by producers a number of times.

"What makes that show good is people suffering and looking like fools," Stamos began. "They’re breaking their feet, calluses. I don’t want that."

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Stamos told Bobby Bones he will never agree to compete on "DWTS." (Todd Owyoung/NBC via Getty Images)

He later added that after repeatedly being asked to compete on the show he finally told producers, "Don’t ever ask me again," telling podcast host, Bobby Bones, "I'm never gonna do that show."

Bones notoriously won the show in 2018 with his pro partner, Sharna Burgess, a win which sparked backlash on social media.

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