"I love you 🙏🏻✨Kisses x" she captioned the sweet photo.
David, on the other hand, decided to take a dig at their questionable '90s dress sense.
"Wow we really did this," the football star wrote. "Happy Anniversary to an amazing wife, mummy and strong business woman 🙏 ❤️"
While Romeo reposted his mum's wedding shot, 12-year-old Cruz shared a different wedding throwback, writing: "Dream mum and dad I can't believe it has been 18 years so happy anniversary @davidbeckham and@victoriabeckham I love you so much and I want you to know that you are the best parents in the whole wide world I love you."
And 18-year-old Brooklyn shared a black and white photo of his parents, writing: "Happy anniversary to 2 of the most amazing people in my life x love you mum and dad"
Anyone else wish these two could adopt them?!
Congrats to the happy couple!
This article previously appeared on marie claire.