The main event had been rife with animosity, with Diaz showing St-Pierre little respect.
Diaz walked over to the cage and yelled something as St-Pierre prepared to enter.
St-Pierre responded by dropping Diaz on his head, capping a dominant first round.
It was St-Pierre's 13th championship fight, second only to the retired Couture (15).
St-Pierre jumped on him and Diaz was again face down on the mat.
Then the lights dimmed and St-Pierre followed, bouncing up and down in his traditional karate garb to pulsating French-language rap.
As expected, St-Pierre used his wrestling to control the chirpy challenger, rag-dolling him at times and bullying him on the ground.
Both men looked tired in the fourth, but St-Pierre scored another takedown and Diaz soon had the champion clamped to him again.
The fight finished fittingly with St-Pierre on top and the crowd roaring.
St-Pierre (24-2) pitched a shutout, winning 50-45 on all three judges' cards.
He backed off the statement after coming late to the news conference and added he wanted a rematch with St-Pierre or perhaps Carlos Condit.
The antagonism continued right up to the fight with fellow fighter Jake Shields, a member of the Diaz entourage, complaining about St-Pierre's hand wraps.
St-Pierre landed another takedown 40 seconds into the second round and soon had Diaz on his knees face down again, hitting him with knees and punches.
The two shook hands, hugged and Diaz raised St-Pierre's hand.
In the lead up to the fight, Diaz skipped a public workout, then put on a strange one-man show at the pre-fight news conference that managed to befuddle and antagonize St-Pierre.
These findings may explain the link between insufficient sleep and overweight that has been shown in previous studies, says the lead researcher, Marie-Pierre St.
At 11am on 13 July 1375, dignitaries and eminent farmers from both valleys met atop the 6, 500ft Col de la Pierre St-Martin mountain pass, laid their hands together on the boundary stone and declared their peaceful intent.
On St Pierre a three-bed, two-bath house is 180, 000 euros, while houses on Miquelon are smaller but with more land and cost about half that.
Panthers keeper Kevin St Pierre had seen the heavy slap-shot from the Giants captain all the way but somehow it crept in the corner.
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