An Australian model got off with a slap on the wrist for drunkenly slugging a flight attendant on Monday when she delivered a sob story to a federal judge in Los Angeles.

Adau Mornyang, 25, faced up to 21 years behind bars for assaulting the United Airlines attendant in January — but was instead given 100 hours of community service and three years’ probation.

Prosecutors wanted Mornyang to spend a month in jail for the attack, in which they said she got loaded on a Los Angeles-to-Melbourne flight and then began “shouting obscenities and racial slurs and flailing her arms” when a flight attendant refused to pour her another.

She hit one of the airline workers and had to be restrained by air marshals, prosecutors said.

Mornyang was convicted of felony interference with a flight crew and misdemeanor assault, but she was acquitted of a third charge for allegedly hitting an air marshal.

A penitent Mornyang admitted she had a drinking problem but blamed it on childhood trauma, adding that she has since sought mental health treatment.

“I’ve learned to deal with my emotions and trauma in a proper way. I’ll do what it takes to prove to the world that I am not that woman,” Mornyang told US District Judge Cormac Carney as she pleaded for “forgiveness, kindness and mercy” from the jurist.

“I do believe she’s remorseful and that she’s committed to getting treatment to make sure this never happens again,” Carney said as he handed down the sentence. “I want you to have a wonderful life. I hope I never see you again.”

With Post wires