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6 December 2013, 11:21 | Updated: 6 December 2013, 11:27
The 'Under The Sun' star appeared to perform 'Heartbreaker' with the 'Scream & Shout' rapper.
Cheryl Cole helped will.i.am close out his UK '#willpower' tour in style last night (5th December) at London's O2 Arena.
The 'Call My Name' star made a surprise appearance during the show to perform a duet with the US rapper of their duet 'Heartbreaker'.
The performance marks one of Cheryl's first high-profile performances in some time, as she continues to work on new music in the recording studio for her next album.
"Unbelievable … #soldoutO2 thank you UK #willpowertour… I never thought this could happen… #dreamsDOcomeTRUE," will.i.am tweeted soon after the show.
Check out a picture of Cheryl performing live with will.i.am at his O2 Arena tour show below (Credit: Xposure):
The US star was also joined on the road across the UK this week by both Conor Maynard and The Voice UK star Leah McFall as support acts.