Jimmy Fallon and The Backstreet Boys give us “Thong Song” A cappella.

Leave it to Jimmy Fallon and The Tonight Show to give us a special harmonious treat just in time for Valentine’s Day with a rendition of Sisqo’s “Thong Song”. Fallon’s  A cappella group “The Ragtime Gals” featured some very special guests for this rendition by welcoming none other than The Backstreet Boys. Enjoy!