Robbie the red-nosed reindeer

Robbie Williams is recording a song for the son of a famous four-legged, red-nosed animal.

According to Dotmusic, the pop star has recorded a version of Frank Sinatra's "Come Fly With Me," for an animated Christmas special called "Robbie The Reindeer."

In the show, Robbie is the famous red-nosed Rudolph's son.

"Robbie the Reindeer" will be shown on BBC TV this Christmas and will be on sale on Boxing Day.

All the profits are going towards Comic Relief.