The pair have been dating since 2018, and have remained low-key for the majority of their relationship.
Macaulay Culkin made a brief return to social media to mark one very special occasion.
On Wednesday, the Home Alone star penned a sweet tribute to his fiancée, Brenda Song, in honor of her 36th birthday.
"Happy birthday to the best friend, mother, ally, colleague, lover, and partner I could ever wish for. You are my reason. I love you. P. S. The milk is due. Can you pick some up on your way home from work?" Culkin wrote.
To kick off the sweet tribute, Culkin shared a candid picture of Song sitting in a robe with a towel on her head, next to a bottle of champagne. Keeping things cheeky, the actor also posted a picture of a carton of milk -- that happened to expire on her birthday.
Culkin, 43, and Song have been in a relationship since 2018. Over the course of their romance, the pair has remained relatively private, aside from rare public outings. News that the couple had gotten engaged broke in January 2022, when Song was spotted with a ring on her finger. She later referred to Culkin as her fiancé, confirming the reports.
The couple shares son Dakota Song Culkin, whom they welcomed in April 2021, and a second son, whom they welcomed in December 2022.
Culkin's post comes after the pair stepped out for a rare red carpet date night earlier this month at the Clarins product launch party. On the carpet, the couple showed minimal PDA while they posed together for pictures.
In December, Culkin gushed about Song, who was on hand with their two sons as he received a star on the Hollywood Walk of Fame.
"Lastly, but not leastly, I'd like to thank Brenda," he said at the end of his remarks. "You are absolutely everything. You're my champion. You're the only person happier for me today than I am."
"You're not only the best woman I've ever known, you're the best person I've ever known," he continued. "You've given me just all my purpose, you've given me family. After the birth of our two boys, you've become my three favorite people. I love you so much."
For more of Macaulay and Brenda's love story, click below.
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