Scotty McCreery fans don't have to worry about success changing 'American Idol's' country crooner. As recently as late February, the 17-year-old was still picking up shifts as a cashier at Lowe's Foods, a grocery store in Garner, N.C. That's after he was the No. 1 trending topic on Twitter, and after he'd impressed judges and fans worldwide during the Hollywood rounds of this season. But those close to him aren't surprised to see him taking nothing for granted.

McCreery's boss at Lowe's Foods, store manager Terry Mascaro, raves about the singer's talents ... as a cashier. "His work ethic was great," Mascaro tells Taste of Country. "He was always a little bit early for his shift and customers loved him. He had a great attitude on the front end."

"In fact, once he started 'American Idol,' it was hard to get any customers to go to any other line in the store," he adds.

The store may soon be down a cashier, even if McCreery doesn't know that yet. Mascaro regularly chats with McCreery's parents, and they talk about how the high school junior's priorities will be changing after the show ends. "If he wants to come back, he's more than welcome," his boss says, laughing.