Nicole Richie celebrated her daughter's 18th birthday, but fans noticed she's now going by a different name on Instagram. In the post, Nicole referred to her daughter as '@katemaddennn,' and her husband Joel Madden also tagged 'Kate Madden' instead of Harlow. This change instantly sparked questions and curiosity among their followers. Observant fans pointed out that the teen's full name is Harlow Winter Kate Richie Madden, suggesting she now prefers to go by her middle name, Kate, at least on
