The 21-year-old has been banned from leaving his home at night after breaking his USD 100,000 bail by failing a drugs test, reported Femalefirst.
Conrad was previously arrested over a 10-hour meltdown while on board a British Airways flight from London to Los Angeles last year, during which he reportedly screamed threats at flight attendants.
However, Conrad - who is the great grandson of the founder of the Hilton Hotels chain, also called Conrad Hilton - has now admitted to violating the terms of his bail bond by smoking marijuana, and has been placed under a curfew until his case comes to court.