All eyes were on Prime Minister Tony Blair’s dashing young son Euan as he arrived at the London premiere of the eagerly anticipated film Iris, accompanied by his mother Cherie and a mystery girlfriend.

The surprise appearance of Blair mother and son, enjoying a rare public night out together, almost upstaged the arrival of the film’s stars, Kate Winslet and Dame Judi Dench, both of whom play novelist Dame Iris Murdoch at different stages of her life in the acclaimed biopic directed by Sir Richard Eyre.

Kate, 26, who looked particularly glamorous in a plunging white Dolce & Gabbana jacket and black trousers, was escorted to the Curzon Cinema in Mayfair, and to the nearby Washington Hotel for the party, by her 21-year-old brother Joss.

The cream of Britain’s acting aristocracy turned out for the film’s glittering premiere, including Vanessa Redgrave, Miranda Richardson, Zoe Wanamaker, Greta Scacchi, James Fox, Nigel Havers and Richard E Grant. The gala night was also attended by Dame Iris’ husband of 40 years, the university lecturer and literary critic Professor John Bayley.

To read more and see the striking photos of the stars and the celebrities, check out this week’s HELLO! magazine, on sale now.