The royal is allegedly a fan of the singer's music and hopes to ask her out on a date as she is newly single and "very sexy".
A source told the Daily Star: "Harry has a double reason for targeting Katy. First he thinks she is a rocking artist with great songs. But secondly she is single and very sexy.
"He sees this as an opportunity to get close to Katy. And he is confident his charm will win her over. And although Katy may have ended it with Russell, she still has a soft spot for wild boys."
Gary Barlow, who is organising the concert to be held in front of Buckingham Palace, recently revealed that Prince William and Harry have requested a number of high-profile US names for the show.
It is believed that Kanye West and P Diddy are at the top of the list of requests.
Elton John, Paul McCartney, Kylie Minogue, Stevie Wonder, Ed Sheeran and Jessie J are among the acts confirmed for the concert, which will take place on June 4.
> Gary Barlow, Andrew Lloyd Webber write song for Queen Diamond Jubilee
Listen to Katy Perry's new single 'Part of Me' below: