The singer's, whose real name is Abel, kicked the birthday post off with this video of a smooch-fest they had...in public!
The kissing didn't end there! He shared this picture of the 22-year-old showing him some love on the cheek at a restaurant.
He also shared this of Bella giving him a peck on the lips and caressing the side of his face.
The "Starboy" singer added this sweet moment from their courtship where they look incredibly happy together. Again, there was a pout involved. None of it was as steamy as this snap of the supermodel lying in a rose-filled bathtub.
OK! readers know, the duo have been spending time together, recently. There was this stroll where they held hands during an outing in NYC last week.
What do you think about The Weeknd's birthday message for Bella Hadid? Let us know in the comments.