Selena Gomez offered her fans a Rare Beauty tutorial on her Instagram timeline while flashing her gorgeous marquise diamond engagement ring.

Music producer Benny Blanco reposted actress and singer Selena Gomez's announcement of their engagement on Wednesday, Dec. 18 after popping the question earlier this month.

Selena Gomez officially has engagement ring syndrome. She can't stop posting about her stunning engagement ring, and it's becoming a brand new fixture in the videos and photos posted to her social media—not that the fans of her and Benny Blanco's adorable relationship seem to find.

Selena Gomez proudly flaunted her fiancée status as she showed off her huge engagement ring while plugging Rare Beauty. And her $1 million marquise-cut engagement ring stole the show.