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.
“She’s just like the best, most genuine person,” he said on the chat show.
“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’…
“She’s one of the sweetest, one of the most charming, one of the most humble people I’ve ever met.”
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.
This year she joined the billionaire celebrity rich list, according to Bloomberg, amassing a $1.3bn (£1bn) fortune – mainly deriving from her Rare Beauty make-up company.