Halsey [1] brought the heat on "The Tonight Show Starring Jimmy Fallon [2]" last night, rocking Pamela Anderson's signature messy updo [3]. The style, which shot to the forefront of pop culture by Hulu's "Pam and Tommy [4]," was a staple of '90s beauty, and now as Y2K trends [5] continue to dominate, it's no surprise that we're seeing it make a reappearance.

Halsey's specific take featured tousled blond beach waves piled on top of their head and a few strategic strands left out to frame the face. Other celebrities who have tried the iconic hairstyle include Selena Gomez [6] and Kim Kardashian [7], who tested the updo while visiting Italy for her sister Kourtney Kardashian's wedding [8].

As celebrity hairstylist Clayton Hawkins [9] previously told POPSUGAR, this is only the beginning of the resurgence of Anderson's beauty looks. "Her classic messy bun [10] is gonna be everywhere this summer," he said. "Everyone is obsessed with Pamela Anderson's fierce '90s beauty these days, and for good reason — it's iconic."

But 1990s beauty goes way beyond hair, which means you can expect to see all kinds of nostalgic trends on the rise in the weeks to come. Think Drew Barrymore [11]'s brown lipstick, Cameron Diaz [12]'s blue eyeshadow, and J Lo's icy gloss. Ahead, check out Halsey's '90s hairstyle from every angle.