Judge Robert Rinder has taken to Twitter to reveal he has been the victim of a street mugging.The TV star opened up about his ordeal to his followers and offered a financial reward for anyone able to assist the police.MORE: Judge Rinder shares rare look inside his home - and it's impossibly grandHe wrote: "I've just had my phone grabbed out my hands by 3 boys wearing balaclavas on bikes (Finchley Road & Canfield gardens).