The Take That star was given the honour of switching on the London display, after performing to huge crowds alongside Leona Lewis and Lawson.
Copyright: PA Images Yui Mok/PA WireThe new display allows people to have their faces appear in the lights, and Williams's face was the first to grace the interactive banner.
Williams said: "Tonight's event was incredible - the Oxford Street crowds were amazing, and it was fantastic being part of the celebrations."
The 38-year-old has had much to celebrate recently, after becoming a father in September and getting his first number one single since 2004 with 'Candy' at the weekend.
The Oxford Street Christmas Lights mark the beginning of the festive season along the legendary high street, which historically takes over £1 billion in sales during the Christmas shopping season.
In previous years, the lights have been switched on by The Saturdays, Leona Lewis and Jim Carrey.
Watch the video for Robbie Williams's 'Candy' below: