"We shot from 6 p.m. until 6 a.m., and Ben was waiting for me in my trailer," Stroh says. "He was waiting for me with a single red rose. Then he took me up to the H Rock, a place at the top of a little mountain that overlooks Salt Lake City, and we watched the sunrise. Then he got down on one knee and asked me to marry him."
Higginson, 24, presented Stroh with "the most amazing ring," she gushes. "It's a princess cut solitaire diamond surrounded by pave set diamonds. I don't ever want to take it off!"
Stroh, 23, is shooting the third installment of the popular HSM franchise in Utah with Zac Efron, Vanessa Hudgens, Ashley Tisdale, Monique Coleman, Corbin Bleu and Lucas Grabeel. None of her costars know about the news yet.
"They are going to be so surprised," Stroh says. "They all love Ben. He's like one of the gang."
Stroh and Higginson, who owns a production company in Salt Lake City, met at a concert in 2007. They are planning a late 2008 wedding.