Selena Gomez was a vision on Benny Blanco’s birthday – and she spent a small fortune on her sparkly outfit. On Monday, Selena’s friend and ex-assistant Theresa Mingus posted several photos from the music producer’s birthday celebrations.

In the caption of an Instagram post Thursday, Gomez wrote that she and fiance Benny Blanco debuted "Bluest Flame," a song from their joint album, "I Said I Love You First," which is out on Friday. She also shouted out Korine and her former co-stars, writing, "@ashleybenson @vanessahudgens @rachel.korine & @harmonykorine we missed you so much."

Selena Gomez is celebrating fiancé Benny Blanco's birthday. Gomez, 32, posted a series of photos of her and Blanco, 37, throughout their relationship via Instagram in honor of her fiancé's birthday on Saturday,