Addison Rae's new hair color is certainly putting the "pop" in "pop star" ... with her style catching eyes all over social media.

The singer-songwriter shared a sizzling pic of her new look to Instagram Saturday morning ... throwing a sultry glance over her shoulder while wearing a tight black leather dress, which revealed a pink garter wrapped around her left thigh.

She added a little more color to the outfit with her hair now boasting bright red coloring spread throughout it ... making a fiery statement in the pic.

She simply captioned the snap, "🔥🐎."

Worth noting ... Addison's new look just changed this week. She attended the 68th Grammy Awards on Sunday -- no trace of the Kool-Aid colored hair yet.

The Recording Academy nominated Addison for Best New Artist at this year's ceremony ... but she went home empty-handed. Olivia Dean took home the trophy instead.

She might not have won a Grammy ... but she definitely deserves a gold medal for her smokin' hot new look!