New couple alert: Jessica Simpson and John Mayer! Wait, what was that?!

"Jessica Simpson has fallen for John Mayer – and she can hardly contain her delight.
"She's head over heels," a source close to the pop star, 26, tells PEOPLE "She's telling friends, 'I'm in love.' "
Even her dad, Joe, is a fan of her new beau. "I love John Mayer," he told PEOPLE Tuesday at the New York City release party for Simpson's new album, A Public Affair. "I love his music. I love his talent. The last time he was at the House of Blues in L.A., I went by myself to see him play." (People)

Are you kidding me?! She left Nick Lachey and picked up John Mayer?! Ok, I like his music but as far as looks go, he got the short end of the stick! What is she thinking?