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A ton of stars celebrated Mother's Day [2] with their loved ones on Sunday, but the holiday was bittersweet for Billie Lourd, as it marked her first Mother's Day without Carrie Fisher. The 24-year-old actress paid tribute to her late mom on Instagram with an adorable throwback photo [3] of the pair, simply captioning it with a heart emoji. Carrie, who famously played Princess Leia in Star Wars, passed away at the age of 60 in December, and Billie honored her at the Star Wars Celebration [4] last month by wearing a white dress reminiscent of Princess Leia's iconic costume.