The Americans actress' rep confirmed the news to Us Weekly explaining that the couple separated over the summer.
Russell, 37, and Deary, married on Valentine's Day in 2007 and are parents to son River, 6, and daughter Willa, 23 months.
No reason has been given for the split.
In other Russell news, the former Felicity star had quite the scare early Wednesday morning as her house was burglarized while she was sleeping. While Russell was unharmed in the robbery, the thieves made off with Filson handbag, a laptop computer and a necklace.