A video that has gone viral on social media shows the moment a man slapped his girlfriend at his birthday party over cake cutting.

The couple were attempting to cut the birthday cake, but it appeared that the woman was not doing it as well as her lover, prompting him to smash the cake on her face.

He then landed a scorching slap on her face, prompting one of the guests to intervene as the situation threatened to escalate.

However, the girlfriend, who had first held back, decided to retaliate and managed to strike a hot slap on her lover before the attendants sought to hold her.