Proceedings during a pre-fight press conference ahead of Canelo Alvarez and Terence Crawford's super middleweight title bout in Las Vegas boiled over when the two boxers got physical with each other.

Months before the pair are set to square off at Allegiant Stadium on September 13, Alvarez and Crawford spoke before fans at Fanatics Fest in New York City on Sunday.

After some expected trash talking, the pair came face-to-face for the cameras.

Crawford began chirping at Alvarez before bumping his chest against the Mexican fighter.

Alvarez then shoved Crawford away - causing people to come rushing in to separate the two.

That included Dana White, the CEO of the UFC. The MMA promotion's parent company - TKO - is promoting the bout.

A reverse angle from White's perspective showed Crawford smiling and then laughing at Alvarez as multiple people held Canelo back.

The bout will see Alvarez put his six belts in the weight class on the line, as he hopes to remain the undisputed super middleweight champion.

Crawford, the WBA super welterweight champion, will be going up from the 154lb class to 168lbs for the bout.

This upcoming fight is set to be Crawford's first since last August, when he beat Israil Madrimov to win the WBA and WBO interim light middleweight titles to extend his record to 41-0.

Meanwhile, Alvarez fought in Saudi Arabia last month - beating William Scull to unify the IBF super middleweight belt with his four other titles in the weight class.