The new song premiered on Dec 10., and is available on Spears's deluxe edition of her Glory album. "Matches" features on the album along with remixes of "Mood Ring" and another unreleased track "Swimming in the Stars," which Spears dropped last week to celebrate her 39th birthday.
The collaboration has been long-awaited — no seriously, 20 years in the making. "What a GLORIOUS day it is... we've been asked about the possibility of a collab like this for the past 20 years and today is the day!! #BritneyXBackstreet is finally here!," the Backstreet Boys tweeted on Friday to celebrate the release.
Check out the new song now.