#6: Hailey Bieber as Britney Spears
Hailey Bieber went full Y2K nostalgia when she dressed as Britney Spears for Halloween. She nailed the …Baby One More Time schoolgirl look, from the knotted white blouse to the cardigan and pigtails tied with fluffy pink hair ties. It was a pitch-perfect tribute to pop’s reigning princess.

The costume wasn’t just about the outfit—it was about attitude. Bieber leaned into Britney’s playful, coy expressions, recreating the music video’s iconic energy. In a sea of elaborate prosthetics and special effects, this simple, instantly recognizable homage stole the spotlight by tapping straight into pop culture memory.
