The Take That star donned a red Santa suit and a thick curly white beard for a sketch which also features TV presenters Ant and Dec.
Robbie took part in the spectacular opening scene shot on London's Southbank and he joined the TV duo on the Text Santa sleigh.
Robbie, whose pre-recorded scenes will air tonight, said: "I'm excited to be taking part and performing on Text Santa, supporting such a great bunch of deserving charities."
The 'Candy' singer continued: "I think I make a great Santa, but I don't know if Ant and Dec would agree with my sleigh driving skills."
Robbie also posted a close-up photo of himself as Santa yesterday (19 December), telling his Twitter followers: "6 MORE SLEEPS. RW x."
Speaking of Christmas, Robbie is also a contender for this year's Christmas No1 single.
Robbie will be hoping to beat the likes of Sam Bailey and Leona Lewis to the post with his re-recorded version of 'Dream A Little Dream Of Me', which features on his number one album, Swings Both Ways.
Catch ITV's Text Santa charity appeal tonight (Friday 20 December) at 8pm.
Watch the video for Robbie's 'Dream A Little Dream Of Me' below:
Check out some celebs who have met Santa!
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