The 49-year-old actor surprised the 42-year-old actress by proposing with an antique ring on the terrace of Cafe de L'Homme with their four children, Liam, Stella, Hattie and Finn, present.
"Dean planned it with the owners of Cafe de L'Homme overlooking the Eiffel Tower and all of Paris to have the terrace all reserved and private for us," Spelling revealed. "The four kids and I were so surprised and so happy."
"It's been a rough few years and this was a perfect family moment for unity and love!" she added before joking, "No date for the wedding is set yet. But our 10-year anniversary will take place in May."
McDermott and Spelling got engaged in December 2005 and married in May 2006. The actor proposed again on the one-year anniversary of their engagement, and the pair also renewed their vows after their fourth wedding anniversary.
The "rough few years" Spelling spoke of refer to McDermott's cheating scandal. The actor admitted to being unfaithful after rumors surfaced in 2014, and the couple chose to document the fallout of the affair on Lifetime series True Tori.
"We had to deconstruct our relationship. We really did," Spelling said on the Today show in March. "I was like, 'You know what? I love this man. I'm going to make this work.' We started at ground zero and built it back up."
McDermott plays Iain Vaughn on Canadian series Slasher and also hosts Chopped Canada. Spelling is known for portraying Donna Martin on Beverly Hills, 90210 and presently voices Pirate Princess on Jake and the Never Land Pirates.