Lady Gaga, Tony Bennett perform at Prince Harry charity fest

Britain’s Prince Harry, right, backstage with Tony Bennett, left, and Lady Gaga, center, pose for photographs after Bennett and Lady Gaga’s performance as part of the Cheek to Cheek Tour at the Royal Albert Hall in London, Monday, June 8, 2015 AP

LONDON, United Kingdom — Hundreds gathered outside Britain’s Royal Albert Hall on Monday, hoping for a glimpse of Lady Gaga, Tony Bennett — and another notable personality, Prince Harry.

The pop stars came to support a charity backed by Harry that helps seriously ill British children receive quality medical care. Bennett and Lady Gaga, who collaborated on the jazz album “Cheek To Cheek,” lavished praise on the prince.

“Your mum was a good friend of mine,” Bennett said of Harry’s late mother, Princess Diana. “I did many benefits with her.”

“That’s fantastic,” Harry replied.

Harry, patron of the WellChild charity, hosted a reception for its supporters and for nurses and families. They were given seats in the Royal Box for the performance.

Harry, who is winding down a decade-long military career, will be devoting more time and energy to his charitable activities. The royal, who is fifth in line to the throne, plans to spend the summer working with animal conservation groups in Africa, which he has described as a long-held dream.