Happy Mother's Day [1]! Celebrities such as Michelle Obama [2], Gigi Hadid, Drake, and Jennifer Lopez [3] are honoring their moms and reminiscing on precious memories with sweet Instagram tributes. "Mom, you are my rock and my best friend, and you have been a guiding light throughout my life," Michelle wrote to her mom, Marian [4], on Friday. Gigi gushed over her mother, Yolanda [5]. "Best I could ever ask for. ❤️ Happy Mother's Day to the one I'll do my best to emulate," Gigi wrote on Sunday. "I love you beyond words @yolanda.hadid you are a superhero!!!!!" Keep reading to see how more stars are celebrating the special holiday!