They enjoyed an on and off romance for over five years, which finally ended in 2010.
But exes Prince Harry and Chelsy Davy have managed to remain close.
The pair, who move in the same social circles, were spotted on Thursday partying in London together following Harry’s return from the US.
They both stayed at exclusive Chelsea club The Brompton until 2.30am, before leaving separately.
Club-goers said the couple greeted each other warmly inside the venue.
The former lovers were joined by a few famous faces including Dizzee Rascal, David Haye and Louis Walsh.
Harry, 27, opted for smart in a suit and black shoes but gave the ensemble a casual edge by forgoing the tie and leaving his top button undone.
Chelsy, 26, looked festive in a red mini dress with black heels.
The Prince has just finished two months of intense military training in California and Arizona.