Years & Years bassist Mikey Goldsworthy served while working as a waiter at upmarket London restaurant the River Café, and he admits the celebrity diners all tipped at varying rates.
Mikey told Q magazine: "Bono was really good. I can't say how much but he was very generous."
"Paul McCartney was not the best tipper, but it meant more. Hes old school so he came and gave it to you personally."
"Chris Martin tipped in concert tickets. Did I want to go? Well, I went reluctantly all the way to Wembley."
He said: "Victoria Beckham was there with David and Gordon Ramsay and I think Gordon paid."
You can sell it I guess...