Heather Rae El Moussa shared a touching tribute to husband Tarek El Moussa’s ex-wife Christiana Haack in honor of her 42nd birthday: “Most will never understand how we are friends.” ...

HGTV star Heather Rae El Moussa tells Fox News Digital how she collaborated with her husband's ex-wife, Christina Haack, for her beauty brand Heather Rae Essentials.