Heather Rae Young gushed about her fiancé Tarek El Moussa’s two kids with his ex-wife, Christina Anstead.“I love being a bonus mom, future stepmama!!” the Selling Sunset star, 32, captioned a Saturday, August 29, Instagram photo with Taylor, 9, Brayden, 4, and their dad, 39. “Watching them grow up in front of my eyes.