It comes after the couple confirmed their relationship last year.Pop star Taylor Swift was among the famous figures to offer congratulations.
"Hey wait... that's my wife," Blanco commented on the post.Swift replied: "Yes I will be the flower girl."
Gomez and record producer Blanco had collaborated on songs I Can't Get Enough in 2019 and Single Soon in 2023, before announcing their relationship.
Blanco, who has also worked with the likes of Rihanna, Calvin Harris and Justin Bieber, was effusive about his love on the Drew Barrymore Show back in May.
"Everything is completely real. Everyday when I wake up, I, like, walk by the mirror as I'm, like, walking to her and I ask myself, 'How did I get here'...
Come & Get It singer Gomez was previously in a high profile on-and-off relationship with fellow singer Justin Bieber.
The Texas-born star rose to fame as a child actress on Barney and Disney Channel, before forging a career as a singer and in acting.
"She's one of the sweetest, one of the most charming, one of the most humble people I've ever met."