Amy Grant underwent an open-heart surgery to fix a rare condition on Wednesday.'Thankfully the doctor said it could not have gone better,' thesix-time Grammy winner's rep told TODAY. 'We’re praying for a full and easy recovery over the next few days, weeks, and months to come.'Doctors discovered the six-time Grammy winner had a heart condition called partial anomalous pulmonary venous return (PAPVR) during a routine checkup, which shehas had since birth.