Selena Gomez’s lacy slip dress is under $50 — and fiancé Benny Blanco approves

Even billionaires love wallet-friendly finds.

Such is the case with Selena Gomez, who posted a nighttime mirror selfie in an under-$50 lace slip.

In her latest Instagram post, the Rare Beauty founder rocked a satin Victoria’s Secret dress in a now-unavailable light pink and orange color combo.

While Gomez’s exact colorway is no longer available, plenty of other shades still are.

Snapping the photo in a dark, candlelit room with “How I Met Your Mother” on in the background, Gomez styled the sultry sleepwear with pink Dolce & Gabbana cat-eye glasses.

The “Love You Like a Love Song” singer wore her dark brunette hair in tousled waves and appears to be fresh-faced before bed.

“wait … i’m gonna marry u,” Blanco commented on the slideshow, which has racked up over 46,000 likes and counting.

Another image in the carousel included a group snap at an outdoor restaurant with actor Logan Lerman.

Gomez also promoted her Rare Beauty body and hair fragrance ($28) with a picture of herself in a leg-baring white dress spritzing the product on her face.

Meanwhile, another pic showed Gomez sitting on the floor in potentially her bedroom, taking a mirror selfie in a midriff-baring ribbed tank with the straps underneath her arms.

Blanco and Gomez are reportedly set to wed next month — perhaps the slip was a tease for her pre-ceremony pajamas.