Singer Rita Ora is reportedly desperate to reconnect with her ex-boyfriend Calvin Harris following their messy break-up earlier this year.

The "RIP" singer has written a letter to her former flame to call a truce and ask his permission for her to perform the songs he wrote for her, including chart-topping single "I Will Never Let You Down", again after he recently blocked their use.

"Rita is desperately trying to make friends with Calvin so she can perform her song again and possible get the tracks back," dailystar.co.uk quoted a source as saying.

"His actions have set the campaign back and she wants to try to repair the damage," the source added.

The hand-written note also featured a message congratulating Harris on the success of his British number "Blame".