"It was a difficult decision but I have decided to file for divorce from Russell," Armstrong told the magazine. "Although we have tried our best to work out our differences, I have come to the conclusion that it is in the best interest of our family that we separate."
Taylor, 39, and Russell, 47, have a 5-year-old daughter named Kennedy. The couple's marriage struggles were highlighted on Season 1 of the Bravo series.
"I am sad for my marriage to come to an end, but am confident that this is the right choice for all involved," Taylor added.
Divorce seems to be common on the Real Housewives franchise. Three of the Orange County cast members (Vicki Gunvalson, Tamra Barney and Jeana Keough) have ended their marriages since the series began in 2006, and both Atlanta's NeNe Leakes and Taylor's castmate, Camille Grammer, also recently got divorced.