She filmed herself scanning the empty corridor outside the courtroom before she performed the sex act on a man sitting on a bench.
'Had so much fun at court today. Found a way to get my charges dropped.... Ssssssh don't tell,' she wrote on Twitter alongside the 34-second video.
Authorities said the shocking incident occurred during business hours at the court and security cameras recorded the sex act.
She was at the court to face charges of possession of drug paraphernalia, smuggling contraband into jail and violation of probation.
Jones was sentenced to time served and was fined after spending two days in prison in relation to those charges.