Connie says: I do-re-mi.
Jeremy Reed, 40, popped the question to the 25-year-old How Do You Solve A Problem Like Maria star just after the curtain call in Cardiff.
Connie said later: "That must be the first time a nun has ever got engaged.
"I am deliriously happy - I knew Jeremy was Mr Right from the moment I met him."
The couple met on a crowded train platform in Cardiff less than a year ago.
Banker Jeremy didn't recognise the star but knew she was in showbusiness and traced her through a friend.
On their first date, Jeremy gave Connie a toy train as a present and by that time he knew she was the singer from the TV talent show.