Justin Bieber performs during the half-time show at the CFL Grey Cup championship football game between the Toronto Argonauts and the Calgary Stampeders. (AP)

Justin Bieber performs during the half-time show at the CFL Grey Cup championship football game between the Toronto Argonauts and the Calgary Stampeders. (AP)

Justin Bieber performs during the half-time show at the CFL Grey Cup championship football game. (AP)

Justin Bieber performs during the half-time show at the CFL Grey Cup championship football game. (AP)

Justin Bieber performs during the half-time show at the 100th CFL Grey Cup game. (AP)

Carly Rae Jepsen performs during the half-time show at the 100th CFL Grey Cup game. (AP)

Gordon Lightfoot performs during the half-time show at the CFL Grey Cup championship football game between the Toronto Argonauts and the Calgary Stampeders. (AP)