The 30-year-old of Laxey posted her news via Instagram this week, showing off her engagement ring beside Mr Stoll. The pair met during Pretty Woman on Broadway in 2018.
Alex posted on his Instagram a photo of himself down on one knee to Samantha on a bridge, with the caption: ‘One knee. One ring. Two happily engaged people. Love you babe.’
Samantha rose to fame as Eponine in the musical film, Les Misérables, in 2012. She will play Elsa in Disney’s Frozen: The Musical in the West End.
Alex starred in Broadway shows West Side Story, American Psycho and Evita.