Her boy is growing up! Hilary Duff is loving her son Luca’s many milestones. The 5-year-old cutie makes frequent appearances on his mom’s Instagram account and on Wednesday she shared some very special ones.

“Look what I found,” Duff captioned a shot of herself holding a silly Luca in her arms. “My favorite little soul. Can’t explain the feeling.”

WATCH: Hilary Duff Wishes Son Luca a Happy 5th Birthday: 'The World Is Yours My Love'


Luca also surprised his mom with a present -- a Lego Wonder Woman watch, which she proudly showed off to her followers.

“This is the first gift Luca has actually picked out for me all by himself. I couldn’t love it more,” she wrote. “Going to wear this bad a** thing till it breaks #luckymom #wonderwomanrules.”

The Younger star, 29, recently celebrated her little boy’s fifth birthday with a sweet post.

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“Hey kid,” she captioned the pic. “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.”

For more from the cute family, watch the clip below!