Los Angeles - Chris Martin "tips in concert tickets".
The Coldplay frontman was one of a number of famous faces 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 and he "reluctantly" went to see the Paradise hitmakers perform after being rewarded for giving good service to the singer.
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."
Working in the restaurant and getting so close to the diners meant Mikey often came home with lots of gossip from overheard conversations.
He said: "Victoria Beckham was there with David and Gordon Ramsay and I think Gordon paid.
"They were going to start a restaurant but it fell through."