A furious wife frogmarched her love rival naked through the streets after allegedly catching her in bed with her husband.
The jilted woman followed her cheating partner to a friend's apartment then burst in on him romping with the younger 20-year-old brunette.
She pounced on the defenceless girl before slashing her hair with a razor and tearing off her clothes.
The scorned woman then drags the girl by the head into the street outside while her two teenage sons, aged 16 and 18, and two of their pals howl to attract attention in Cubatao, Sao Paulo, Brazil.
Shockingly, the family then boasted about the attack online sparking dozens of complaints to police and an investigation to find the victim.
The seething wife wrote on social media: ''I do not give a damn what they think or stop thinking. I'll show you how you deal with the traitors of a married man. I just got this sl*t with my husband, ex-husband from today.''
The injured woman was picked up by the sheepish husband - afraid to step in on his wife's relentless attack - and helped his lover find her clothes.
Police initially launched an investigation to find the victim but later identified her after her sister took her to the station to make a statement.
She told officers that the man had claimed to be single and they had been together for five months.
The attacker was arrested by Civil Police officers and now faces up to ten years in jail on suspicion of threat, bodily injury, injury, defamation, crime of intolerance, violence against women and torture.
A spokesman at the regional police station in Cubatao said the alleged attacked had been questioned.
They said the case is being investigated at the police headquarters of Cubatao.