THIS was the moment a best man fainted at the alter as the maid of honour serenaded the bride and groom.

Guests were left stunned when the man crashed face-first on the hard floor - and smashed his teeth out.

The best man's faceplant, which happened during the outdoor celebrations in Snohomish, Washington, was caught on camera.

In the footage, the maid of honour is seen choking back tears as she performs an emotional ballad for the newlyweds.

Suddenly, the best man loses consciousness before hitting the deck, bringing the celebrations to an abrupt halt.

The music stops as guests rush to the man's aid.

One onlooker is heard shouting: "Someone bring him water."

Chaos ensues as more guests gather around the fallen man, while others rush off to get help.

Minutes later, the man is seen being escorted away from the scene while pressing a napkin to his mouth.

According to Jukin Media, the man broke some of his teeth when his face hit the ground, but he did not suffer a concussion and was otherwise uninjured.