BRITs host James Corden said during an interview on BBC Radio 2: "I think - and I don't know if this is true and I'm almost certain that I'm not supposed to tell you - that Chris Martin is going to accompany Noel on the piano."
Its shaping up to be a busy night for Chris, as Coldplay are also due to perform their duet with Rihanna, 'Princess of China'.
In addition, Ed Sheeran, Rihanna and Florence and the Machine will also perform at this year's BRITs, while Adele is expected to make her first UK public appearance since suffering a vocal cord haemorrhage in October.
War Child Music Director, Ben Knowles, said: "War Child's annual BRIT Awards show has become a unique and important date in the music calendar.
"We believe music can make a difference, it can change lives. This year's amazing line-up will prove that - it will make for a stunning, unforgettable night and one that will raise money to help thousands of children affected by war."
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