Nicole Richie seemingly dropped a major clue about her and husband Joel Madden's daughter, hinting she no longer goes by Harlow. "18 years of you ♥️🎂 @katemaddennn," Richie, 44, wrote via Instagram on Monday, January 12, in a joint post with Madden, 46. The upload, which featured memories with their eldest child, was in honor of her milestone birthday. "That's my girl ❤️✨," Madden wrote in the comments section. He also reshared the series of photos via his Instagram Stories, tagging @katemaddenn as well.