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1 November 2013, 10:14
The UK singer sang 'Dream A Little Dream' with 'Candy' star Robbie at the charity gig.
Lily Allen performed alongside Robbie Williams dressed up as an alien for a Halloween-themed charity event last night (31st October).
The 'Not Fair' singer dressed all in green, with green costume paint all over her face and body, for the UNICEF Halloween Ball at One Mayfair on Thursday evening.
As part of the show Lily also got up on stage alongside a suited and booted Robbie Williams to perform their cover of 'Dream A Little Dream' together.
Check out a picture of Lily Allen performing with Robbie Williams at the event below (Credit: Getty):
The collaboration features on Robbie's upcoming new album 'Swings Both Ways', and continues to herald Lily's return to music.
The UK singer-songwriter has been steadily working on new music for the past year and has teased a potential release date of March 2014 for her next album.