The 29-year-old star welcomed Luca, whom she shares with her ex-husband Mike Comrie, in March 2012.
On the occasion of her son's fifth birthday, Duff took to Instagram to post a heartfelt message for him.
"Hey kid.... The past 5 years have been the BEST, hardest, most blessed years of my life. I love you so much. The world is yours my love... I hope you take it Happy Birthday Luca Cruz," she wrote alongside a picture of Luca.
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