It's been a rough week for Grand Ole Opry member George Hamilton IV. The singer, known as the 'International Ambassador of Country Music,' was hospitalized on Saturday (Sept. 13) after suffering a serious heart attack.

The 77-year-old started out on the pop charts with his debut single, 'A Rose and a Baby Ruth,' in 1956, before switching to country music in 1959. He became a member of the Grand Ole Opry in 1960, which was the same year he signed a record deal with RCA Records, after catching the attention of Chet Atkins.

According to an update posted to his website on Sept. 14, the North Carolina native "remains in critical condition, but is resting comfortably in a Nashville hospital. He and his Family greatly appreciate your ongoing prayers and respect for their privacy at this personal time. More updates as the week progresses."

The Boot extends our well wishes to Hamilton for a speedy recovery.