Carrie Underwood’s rear is off limits—unless you’re Loretta Lynn.

The country megastar recalls with Billboard the time she first met Loretta, who approached Carrie at an awards show by tapping her on the behind.

“If there’s one person that can smack me on the rear, it’s her,” Carrie joked at the recent American Music Awards.

The “Heartbeat” singer knows that without Loretta, she wouldn’t have the career she has today.

“Loretta Lynn is absolutely incredible,” she adds. “It’s women like her who paved the way for women like me.”

Loretta was recently honored as the Billboard's Women in Music Legend. Watch Billboard's Women In Music tonight  (12/18) at 8/7c on Lifetime.