Luann, 54, marked the milestone by posting a handwritten letter to Instagram on Wednesday, August 27.
"Hi my friends, I'm happy to say after a long difficult year ... I've made it through! I'm humbled and grateful for this life lesson and ready to put the past behind me and move on with my life. Wish me luck! Thank you for your undying support over the years," the note read.
The Bravo star struck a plea deal in July 2018 and pleaded guilty to battery, trespassing, and disorderly intoxication.
She was placed on probation for one year and ordered to pay fines, attend AA meetings, perform 50 hours of community service, and submit to random drug and alcohol testing, among other things.
The cabaret star went to rehab shortly after her arrest in January 2018. She checked back into rehab for a second time in July 2018.