A young mom was beaten unconscious by a violent man in a vicious attack at a concert after a drink was accidentally spilled on him.

Shelby Elston, 33, was excited to see Rüfüs Du Sol at the Rose Bowl Stadium in Pasadena, California on Saturday, but her night took a horrifying turn after a stranger attacked her.

The horrific assault was caught on camera and showed the moment the unidentified man threw several punches at Shelby while another woman attempted to hold him back.

The victim was seen sitting limp on the floor in the footage while her fiancé, Cain Webb, attempted to protect her.

'[I'm] still trying to find the words to describe exactly what happened to us last night,' Elston said in a post on Facebook.