The Only Way Is Essex star James Argent has not made any contact with friends or family since 3am on Friday morning, police said.
At the time of his disappearance James was wearing a blue tracksuit, believed to be Nike brand and in possession of a blue sports bag. He is known to frequent the Brentwood area of Essex and various nightclubs in the Redbridge area.
Police said they were "increasingly concerned for his wellbeing" and asked anyone with information on his whereabouts to call police.
More top news
Nobody knows what the outcome of tomorrow's election will be - but it's clear the winds of change are blowing hard, writes Tom Bradby.
Ukip party leaders have vowed to overhaul candidate vetting processes after a string of allegations emerged just days before the election.
ITV News is ready to bring you all the results and drama from the most exciting and unpredictable general election night in a generation.