Nicole Richie has confirmed that her 18-year-old daughter has always gone by her middle name, Kate. Speaking to People, Richie said, "Yeah, she goes by her middle name. She has her whole life." Curiosity sparked after Richie marked Kate's 18th birthday on Instagram with photos and the caption, "18 years of you @katemaddennn." Richie and husband Joel Madden welcomed daughter Harlow in 2008 and have a younger son, Sparrow.
