"Don't you know who I am??"

Not everyone knows who John Mayer is. On September 29, Mayer and his new girlfriend, Friday Night Lights star Minka Kelly, picked out $400 worth of goods at Circuit City in Santa Monica. But when the singer went to pay with his American Express Black Card, the clerk - who didn't recognize Mayer - asked to see an ID, says an eyewitness. After Mayer said, "I actually lost my ID and don't have one," the clerk "advised John he would not be able to buy anything." "John was so embarrassed. Minka was smiling and giggling and rubbed his back in support." Eventually, the clerk figured out who he was, approved the purchase and apologized profusely. Says the onlooker, "John and Minka laughed and said it was no big deal before they paid and left the store holding hands."