Jessica SimpsonJessica SimpsonIt's official: John Mayer has passed the parent test.

So Jessica Simpson must be breathing a huge sigh of relief.

There were rumblings her dad, Joe, wasn't the biggest fan of her marriage to ex-hubby Nick Lachey at first, but according to People, Joe's given John the royal stamp of Simpson approval.

"If Jessica is in love, I love the things she is in love with.

"I want her to be happy. I'm always a fan of his. I love him; he's got great music," Joe Simpson told People.

"I think the beautiful thing is that (he and Jessica) don't do the same thing.

"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."

John MayerJohn MayerThe only thing left to ponder is if John feels the same way about the Simpsons...