The former child star-turned-U.S. reality TV favourite left her rehab facility to attend her daughter Brooke's nuptials in Cabo, Mexico on Saturday (23May15).
Hilton and her sister Nicky both served as bridesmaids and Richards' estranged sister Kyle was also part of the wedding party.
The Real Housewives of Beverly Hills star appeared to be healthy and in good spirits as she celebrated her daughter's big day, posting a photo of the party online, with the caption, "Love my gorgeous family!!"
Richards checked into a rehab facility after she was arrested following an alleged drunken altercation with a police officer at the Beverly Hills Hotel in April (15).
She still faces jail time after being charged with public intoxication, resisting arrest and battery. Richards is due in court for an arraignment hearing on 11 June (15).