An 18-year-old left a neighbour with a bloody face after hitting him with a pint glass in a row about noise.
Ella Dare struck Andrew Jones with the glass just days after celebrating her 18th birthday with a raucous party.
Mr Jones was left with a deep gash on his forehead and photos show him with blood running down his face and over his T-shirt.
A court heard Dare and boyfriend Macauley Mason, 24, had been involved in a row over noise in the street when a fight broke out.
Waitress Dare lashed out using a pint glass to hit both Mr Jones' to the head and partner Crystal outside their home.
A probation report said: "Due to her and her partner being loud in the street there was an altercation.
"She said she fell to the floor and the victim Crystal got on top of her. She said she got up, panicked, and admits hitting the other victim to the face and causing the injuries.
"She said she was protecting her partner."
The report for Mason said: "He says that he on the night in question was being loud and understands his behaviour could have caused fear to others.
"He says he was reacting to a situation and should have walked away."
Dare admitted unlawful wounding and actual bodily harm over the attack in August 2020 at Newport Crown Court.
Mason admitted a public order offence for using threatening words or behaviour.
The court heard the couple "deeply regretted" their actions Peter Donnison, defending Dare, said: "It is two years since the time of the offence and she was of a very young age, being just 18 at the time, now 20.
"She has genuine remorse for being involved in this incident. What she says is she should have walked away."
The court heard Dare worked 25 hours a week as a waitress, as well as undertaking a college course studying business, with the aim of undertaking a degree in future.
Claire Pickthall, defending Mason, said: "He is clearly a young man who has difficulty regulating his emotions and he has remained out of trouble since August 2020.
"A stable relationship with Miss Dare has been a positive influence on him.
"He is remorseful for being involved in this offence and the person who he cares for very deeply got involved in this."
Judge Daniel Williams said the couple had changed their pleas after the start of their trial.
He said: "Ella Dare has admitted unlawful wounding. That reflects she struck Andrew Jones with a pint glass causing him an injury.
"She admits causing the wounds to Andrew Jones but not intending to cause him serious harm.
"She also struck Crystal Jones with a pint glass but didn't cause any wound."
Dare, of Cwmbran, was handed a 12-month community order, must complete 100 hours unpaid work and 10 days rehabilitation requirement.
Mason, also of Cwmbran, was handed a 20-day rehabilitation requirement.
Judge Williams told the couple: "You have admitted your parts in an incidence of violence.
"If the two of you stay out of trouble for the next 12 months and complete those requirements that will be the end to this. If you fail you will be brought back to court."
