He's known as Harry Potter's nasty nemesis Draco Malfoy, but in real life Tom Felton does have a softer side.

The 20-year-old actor was all smiles as he hit the red carpet at the London premiere of The Dark Knight last night with an attractive brunette on his arm.

The mystery Quidditch WAG turned heads in a thigh-skimming black frock and towering heels, while Felton traded in his Hogwarts uniform for gun-metal grey slacks and a black shirt.

Number one fan: Tom Felton attended the Dark Knight premiere last night with an attractive brunette companion

The couple were among a star-studded crowd, including the film's leading actors Sir Michael Caine, Christian Bale and Maggie Gyllenhaal and celebrities including Peaches Geldof and Alexa Chung.

Of course, Felton will soon attend a premiere of his own - Harry Potter and the Half-Blood Prince is set for release in the UK in November.

Leading lady: The couple leave the premiere hand in hand

Enemy: Tom as Draco Malfoy

The star says fans should expect the sixth installment to reveal much about his character's complexities.

He says: 'There are reasons that Draco is the way he is.

'He’s seen so many things and been taught so many wrong ideas from his father, Lucius, and of course he worships his father.

'He wants to be like him, to emulate him in every way. But his father has been involved in Voldemort’s dark circle for many years, so it’s not unusual that Draco would want to follow that path too. Everything is to please his father.'

His latest performance has already received high praise from film producer David Heyman.

He says: 'Tom’s nuances in the new film are terrific. It feels like a deeper richer character than we’ve seen to date.'