In the ultimate 90's mashup, Britney Spears and Backstreet Boys have collaborated on a song this holiday season.br According to CNN, Spears dropped the new song, "Matches," early Friday morning.br She posted on Twitter, "'Matches' featuring my friends @backstreetboys is out now !!!! ".br Her tweet went on to say: "I'm so excited to hear what you think about our song together."br The boy band was equally thrilled, tweeting, "#BritneyXBackstreet is finally here!"br The single is featured on the deluxe reissue of Spears' 2016 album "Glory.