updated 02/21/2013 AT 3:00 PM ET
•originally published 02/21/2013 AT 6:45 PM ET
Country singer and former Survivor contestant Whitney Duncan is engaged – and this time it’s not a secret.
Duncan, 28, was secretly married when she met and fell for Tollefson, 27, on Survivor: South Pacific in the summer of 2011 but now the tribemates are headed down the aisle.
“He did good,” Duncan wrote on Facebook along with a photo of her sparkling engagement ring of interlocking circles in a complex pattern.
Fallgatter and Duncan had kept their marriage a secret from even friends and family until Duncan confessed her feelings for Tollefson to Fallgatter during a phone call made just before she returned from filming Survivor, a source close to the couple told PEOPLE in 2011.
The country couple’s divorce proceedings were complete in November 2011 and now Duncan and Tollefson – a self-described environmentalist – are happily celebrating their impending nuptials.
“Thanks to everyone for the best wishes on mine and @whitneyduncan’s engagement,” Tollefson tweeted. “I know real original proposing on Valentines day ha.”