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When a surprise musical performer mysteriously dropped out of a starry Women’s Cancer Research Fund/Breast Cancer Research Foundation event on Thursday night, quick-thinking Jamie Tisch texted Chris Martin, who we hear ran to the Beverly Wilshire Hotel in jeans and a T-shirt to play tunes by Prince, Wham!, Leonard Cohen and David Bowie.

The Coldplay rocker even stuck around to play the piano throughout dinner.

“He was having fun pretending he was a lounge singer,” said a spy.

Honorary chair Tom Hanks jokingly passed a tip jar around the room for Martin and quipped that it raised $70,000.

Hanks further entertained the crowd when a video tribute to honorees Leonard and Judy Lauder and Tom Ford malfunctioned by instead singing an impromptu ode to the cancer charities.

Meanwhile, Leonard — who remarried in 2015 when he was 81 and Judy was 76 — joked, “Ladies, for those of you who are single, never give up.”

The Estée Lauder mogul ribbed Ford by saying his granddaughter was wearing one of the designer’s frocks, but that he had to “pay retail.”