Rex

Rex

Harry Potter and the Deathly Hallows proved itself to be one of Britain's most popular exports last night as quintessential New Yorker SJP brought son James and husband Matthew Broderick along to meet and greet Brit stars Emma Watson, Daniel Radcliffe and Rupert Grint.

Following last week's world premiere Harry Potter and the Deathly Hallows' biggest stars were still in high spirits and enjoyed signing autographs for James and talking all things Potter with an Alexander McQueen-clad Sarah Jessica Parker at the film's after party.

SEE ALL THE HARRY POTTER PREMIERE PICS HERE

Also working Alexander McQueen accessories was fellow fan and Madonna's super-stylish daughter Lourdes.

SEE EMMA WATSON'S STAR STYLE HERE

The family theme continued as Emma Watson - who nailed red carpet dressing for the second time running in a silk Calvin Klein dress and matching heels by the designer - brought along her younger brother Alex Watson.

Alex, who starred with Emma in last year's Burberry campaign and is signed to Storm models, looked just as chic as his big sister as he accompanied her on the red carpet. We can't think of a better wingman!

WATCH A DEATHLY HALLOWS CLIP BELOW

WATCH ALL THE ACION FROM THE DEATHLY HALLOWS LONDON PREMIERE BELOW

By Hayley Spencer