Watch Blake Shelton Fail to Name One of Gwen Stefani’s Biggest Hits

Uh oh.  Blake might want to brush up on his girlfriend’s music. He was on The Tonight Show Starring Jimmy Fallon on Monday, where he played the “Name That Song Challenge.”

but when they got to Gwen Stefani’s massive 2005 hit, “Hollaback Girl,” Blake couldn’t get it

In his defense though watch and see how many you could get right! These are tough.