Over the course of a decade, they became the most famous, well-paid and perfectly groomed group of actors on television. And since the final episode of Friends aired in May 2004 - with an audience of 52.5 million viewers in the US alone - the show's many ardent fans have fantasised about a reunion.On Sunday night, as part of NBC's Must See TV: An All Star Tribute to James Burrows, who directed the show, five of the six Friends finally gathered on a sofa as part of the two-hour pre-recorded special.The only member of the cast absent from the reunion was Matthew Perry, 46, who recorded a video message, introducing his co-stars, for the show. At the time of filming, he was already in London, rehearsing his play, The End of Longing, which he has written and is starring in. He is sporting the requisite stubble of a true creative now, too.Matt LeBlanc, 48, has gone completely grey, but David Schwimmer, 49, still has jet-black hair, as does Courteney Cox, 51, who has begun to look a little suspiciously feline around the eyes though.The Friends were friends in real life, with the six actors explaining that they would watch the show together every week, at one another's apartments. ..