BLACK EYED PEAS singer WILL.I. AM joined his protégé CHERYL COLE onstage last night.
The Boom Boom Pow star shared the limelight during Chezza's support slot at the O2 Arena in London.
Their duet comes as no surprise, as their friendship continues to blossom faster than you can say 'are they? aren't they?'
Cheryl showed off her tattoo in a thigh-skimming toga, bound together by silver sequin shoulders.
Will.i.am, real name William Adams, looked like he was about to head out the door - still in his trench coat and sunnies.
Having joined forces back in 2008 - when Cheryl featured on the rapper's solo song Heartbreaker - their relationship has gone from strength to strength.
Chezza returned the favour in 2009, inviting will.i.am to sing on her debut solo record 3 Words.
Following further studio work together, the GIRLS ALOUD beauty has now stepped into the shoes of support act for the Black Eyed Peas tour.
And on Wednesday, the rapper even met Cheryl's mum JOAN.
He said: "Joan is a great lady. You can see why Cheryl is such a good girl, she gets it from her mum. The most important thing for Cheryl at the moment is to have a man around her who she can trust and who makes her laugh. I promised mum that's what I'm doing."