Most people avoid their exes like the plague.
But Prince Harry and Chelsy Davy attended the same venue last night, both soldiering on until 2.30am.
Club-goers said the couple greeted each other warmly inside The Brompton Club, situated in the exclusive area of Chelsea, London.
Sources said the prince and his ex, 26, chatted without any obvious awkwardness, although it is unlikely that his recent liaison with a tattooed cocktail waitress would have been a topic of conversation.Socialites: Prince Harry and ex-girlfriend Chelsy Davy attended the same venue last night, partying until 2.30am at The Brompton Club
The pair were joined by an odd mish-mash of guests, including Dizzee Rascal, David Haye and Louis Walsh - hardly known for his wild ways.
Harry, 27, opted for a smart-casual look, choosing to wear a suit and black shoes, but ditching the tie and leaving his top button undone.
Former flame Chelsy, 26, wore a a festive red berry mini dress, teaming the frock with black heels and a winter coat jazzed up with a purple lining.Greeted with a hug: Harry embraces Chelsy prior to hitting the club, at The Henry Van Straubenzee Memorial carol concert at St Luke?s Church, Chelsea
No bad blood: Chelsy looked happy to see Harry and shot him a beaming smile, before he chatted to his sister-in-law's mother Carole Middleton
Eyes meeting across the room: Harry seems to find his ex-girlfriends' gaze despite several people sandwiched between them
Earlier in the afternoon, they came into contact at The Henry Van Straubenzee Memorial carol concert at St Luke's Church, also in Chelsea.
The pair were seen greeting each other with a friendly hug as they attended the event of which Harry is a patron for the charity.
They were also joined by Kate and Pippa's mother Carole Middleton.
The couple appear to have had a complex history, with their turbulent relationship causing them to split four times between 2004 and 2009.
Earlier this year, there was speculation they would rekindle their romance once more, however Harry publicly stated he was '100 per cent single'.
Then at his brother's wedding to Kate Middleton in April, rumours circulated that Harry was more interested in flirting with maid of honour Pippa than watching Prince William take his vows.Strange guestlist: Louis Walsh attended, alongside David Haye and Dizzee Rascal
Harry has just returned from the US, where he underwent two months of intense military training in California and Arizona.
A rep for Naval Air Facility El Centro in El Centro, said: 'Captain Wales has completed his training in the United States and has returned to the UK.'Going home alone: Chelsy didn't seem to be in the mood to continue the party and caught a taxi solo
Time for bed: Chelsy avoided posing for photographs as she headed home