When Prince Harry met pop royalty Lady Gaga on Monday, it was for the benefit of sick children under the British charity organization WellChild. The pair met at the Royal Albert Hall to support a WellChild benefit concert, reports the Mirror.

Harry was introduced to Lady Gaga in the foyer of the west London concert hall. Gaga looked stunning in a floor-length silver sequined dress by Brandon Maxwell, with matching diamanté eyebrows, while the newly knighted prince went for a casual look in a navy suit and open-necked white shirt. The two were photographed alongside 88-year-old crooner Tony Bennett, who collaborated with Gaga on a recent album.  

The prince watched Gaga and Tony Bennett perform during the gala concert, singing jazz standards from their album "Cheek To Cheek." When the royal thanked the two singers for supporting the charity, Gaga told Harry: "We are so happy to be here tonight and be of any help. We think you are fantastic. And thank you for bringing it here so we can support you," states E! News.

Bennett also told Harry that he was close friends with Harry's late mother, Princess Diana. "Your mum was a good friend of mine. I did many benefits with her," he said, to which Harry replied, "That's fantastic."

Harry also met families who have benefited from WellChild's support -- including staff, nurses and donors to the charity -- at a reception before the event. Fifteen-year-old Flynne Ewart-Biggs from north London, who has been having treatment for a brain tumor for 18 months, was there with her WellChild nurse Diane Miles. The teen told reporters, "Harry was a nice guy and it was fairly easy to talk to him."

The 30-year-old prince has been patron of WellChild since 2007 and has gotten to know many of the children the charity has supported over the years. According to People, WellChild Chief Executive Colin Dyer shared that Harry has had an impact on the organization: "Most of our work centers around the family," Dyer said. "The most important thing he gives to us is that time spent listening and understanding the situation the families find themselves in. That is not always easy for people to do when faced with a sick child." The benefit concert reportedly raised more than £100,000 ($153,435) for WellChild. 

Meanwhile, Gaga and Bennett are currently touring in support their Grammy-winning album. The two are expected to perform another show at the Royal Albert Hall on Tuesday night, followed by a show in the Bahamas on Saturday.