“He called my dad and got his blessing first,” Lambert tells PEOPLE about Shelton’s surprise proposal on May 9. “That was so Southern and old-school and perfect.”
Equally perfect: The diamond-and-platinum ring “Hillbilly Bone” singer Shelton, 33, chose on his own.
“I was so proud of him,” says Lambert, 26. “We’ve been together five years, so he knew exactly what I wanted but it’s so much more perfect than I could have picked out myself.”