Bellingham equalised from 30 yards before volleying a stoppage-time winner to take his goal tally to 13 in 13 appearances since moving to Los Blancos.
Jude Bellingham scored twice as Real Madrid took El Clasico honours with a 2-1 win at Barcelona.
The England midfielder struck with a 30-yard drive to cancel out Ilkay Gundogan’s early goal for the hosts.