Selena Gomez just turned 31 -- and with this turning of the page, the internet's also adorning her with some big alleged news ... namely, that she's almost a billionaire.

The singer is being celebrated left and right on Twitter right now because on Saturday ... she hit the big 3-1. But more than just sending her well-wishes on her special day -- it seems like people are also congratulating her on this huge purported spike in her net worth.

Rare Beauty

The number being floated is $800 million. The site CelebrityNetWorth.com is the one that's putting this figure out there, citing the sales of her makeup line Rare Beauty as the X factor.

This new (unofficial) inflated net worth seems linked to a recent Bloomberg report, which says Selena's Rare Beauty blush, on its own, generated around $70 mil last year ... while also claiming RB is expected to fetch at least 3x that amount on this one product in 2023.

Waiting for your permission to load the Instagram Media.

ncG1vNJzZmivp6x7tbnZZ5qopV9nfXN%2FjmluaGpiZMCmuMSnmGafn6Kyu3mSaqqtZZKev7W0w5qwZqaVqXq4u9Gtn2aroJ64pnmXaWdmpZmhuaq7zWg%3D