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Ever since little Luca Cruz Comrie [3] entered the world in 2012, proud mom Hilary Duff hasn't been able to stop sharing adorable photos of him [4]. In honor of his fifth birthday on Sunday, the Younger [5] star posted another sweet snap of her son on Instagram [6], and the caption contains a touching message. "Hey kid.... the past 5 years have been the BEST, hardest, most blessed years of my life," she writes. "I love you so much. The world is yours my love ...I hope you take it❤️ Happy Birthday Luca Cruz." The difficult times she mentions are likely in reference to her and Luca's father, Mike Comrie, finalizing their divorce [7]. Despite a few bumps in the road, it seems Hilary and Luca [8] have another great year ahead of them.