He won the approval of Ashlee Simpson.
God knows why.
Now John Mayer has been signed off on by someone even more central to his girlfriend's life. Her controlling, money-grubbing dad, Crazy Joe Simpson.
Joe may not have approved at first of daughter Jessica Simpson's marriage to Nick Lachey, but he's given her new man, John Mayer, the thumbs up.
"If Jessica is in love, I love the things she is in love with," said Joe Simpson, 49, at the Entertainment Weekly upfront party at The Box in New York City on Tuesday.
"I want her to be happy. I'm always a fan of his. I love him; he's got
lame great music."
Simpson wasn't such a fan of Nick Lachey when Jessica married the former boy band dweeb in 2002.
"Everybody thought, including my father, that my marriage to Nick would kill my career," Jessica told 20/20 in 2004.
But Joe Simpson says Mayer is a different story.
"I think the beautiful thing is that [John Mayer and Jessica] don't do the same thing," he told People. "He's a legend already. There is no competition. He's a guitarist; that's his thing. Jessica is a singer. She doesn't play guitar, so there's no competition."
Last month, Jessica and her enormous boobs joined Mayer in Australia, where he was on tour, but she's currently in Europe for the Cannes Film Festival.
For his part, John Mayer was recently in New York City, where he played political strategist to presidential nominee John Edwards.
And you wonder why he's running third in Democratic polls.
So what is Joe Simpson doing at the TV upfronts, where networks present their new lineups? "I'm executive-producing a new show that just got picked up called Women's Murder Club," said the Simpson patriarch and pimp.
"It's [based on] a James Patterson [book] series. We were here for the ABC upfronts â€" Angie Harmon, Laura Harris, Paula Newsome. We've got ourselves a great cast."
Will Jessica or little sister Ashlee be making any cameos?
"This is one thing I'm actually trying to do on my own."
That and wrecking his car and driving off.