A close source said: "Bellamy had a real go. He really let Curbishley have it.
"He was really upset about how the team played. Everyone was shocked to see the pair at each other's throats. It was incredible."
Bellamy, who was making his Premiership debut for the Hammers, was furious at Curbishley's tactics and let him know afterwards with both barrels.
But his outburst could now leave his career in tatters, having only just signed for £7.5million from Liverpool this summer.