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Watch B.o.B Sing Jessie J's 'Price Tag' Chorus at Billboard's WinterFest

Todd Williamson/Invision for Billboard/AP Images
B.o.B performs at Billboard's Winterfest at Park City Live on Thursday, Jan. 22, 2015 in Park City, Utah.

When B.o.B performed "Price Tag" at Billboard's Winterfest in Park City, Utah, on Thursday night, he had a fun surprise for fans, singing a bit of Jessie J's chorus as well as his rap.

Sundance 2015

"If you consider yourself a real music fan, I feel like you know what the f--k is about to happen right now," B.o.B declared before launching into the hit. The Sundance crowd seemed to love it -- check out the full performance below.