Mandy Moore is celebrating her adorable son Gus on his first birthday. 

On Sunday, Feb. 20, the “This Is Us” star took to Instagram to share a montage of photos and videos from the first 12 months of her toddler’s life.

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“Gus- Being your mom is a gift beyond my comprehension, a love so fierce and mighty that I know I will never touch the depths of,” wrote Moore in her caption. “Happy Birthday to our ever joyful and curious boy!!! You turned on all the lights, Goosey.” 

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The video, which is set to Randy Newman’s “Memo to My Son”, sees Gus wearing a pair of sunglasses, breastfeeding, hanging out on a swing and playing the piano with dad Taylor Goldsmith.

Moore and Goldsmith tied the know in November 2018.

The actress finished off the post by adding the hashtag, #ThisIsGus.