Made in Chelsea's C4 Mash Up

On January 4th 2013 the Channel 4 Mash Up returns for a night of show-swapping fun from our favourite Channel 4 stars.

SW3 features large, with a number of Channel 4 faces swapping their postcodes for Made in Chelsea as they strut their stuff and party with London's glamorous young socialites.

However, the biggest shock visitor isn't a C4 face, but is none other than Jamie's ‘little sister'.