John Mayer

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John Mayer is not done changing.

Or at least, that's the working title of his new song, which he debuted on stage at the Cool Comedy - Hot Cuisine fundraiser in Los Angeles, hosted by comic and Full House star Bob Saget, 59.

The 37-year-old crooner started off by tuning his acoustic guitar, joking, "Most of the weird s--t I've ever said in my life was during the tuning."

"This is a song I wrote not long ago and I'll play it for the first time outside of my house. I think it's called 'Done Changing' or 'Changing' or 'I Am Not Done Changing,' he said, before he launched into his new, folk rock-sounding tune.

Mayer, who has called himself a "recovering ego addict," also performed two his past hits as well as a cover of Tom Petty's "Free Fallin'."

He was joined at the event by Bob's co-stars John Stamos, 51, Jodie Sweetin, 33, and Andrea Barber, 38, all of whom will appear with the Full House patriarch in Netflix's upcoming sequel reunion series Fuller House, Variety reported.

Bob Saget, John Stamos

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John Mayer, John Stamos

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The fundraiser benefitted the Scleroderma Research Foundation. Bob is a member of its board. His sister, Gay Saget, died of scleroderma, an autoimmune disease, at age 42 in 1994.

Other celebrity performers included legendary insult comedian Don Rickles, 89, fellow comics Jim Gaffigan, 48, and Jeff Garlin, 53, and talk show host Jimmy Kimmel, 47, who was accompanied by wife Molly McNearny, 37. Jack Black, 45, and Kevin Connolly, 41, who reprises his role as E in the new Entourage movie, also attended.

Mayer's on-again, off-again girlfriend (current relationship status: It's complicated) Katy Perry, 30, was not spotted.

And Stamos, well, he did a lot of Stamos-ing.

Jimmy Kimmel, John Stamos, Don Rickles

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John Stamos, Don Rickles

Jason Kempin/Getty Images

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Kimmel co-hosted an auction with Saget, during which they bantered back and forth hilariously. When the bidding began, Queen Latifah, 45, whose mother is battling scleroderma, got up from her chair and urged people to keep bidding higher.

Connelly, who sat at a table with several of his Entourage co-stars, won a $10,000 2015 Victoria's Secret Fashion Show package. Two autographed guitars that belonged to Mayer each sold for $10,000.

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