Prince Harry has sparked rumours of a new romance after he was spotted partying with a blonde socialite.

The British royal attended a premiere of new Batman movie The Dark Knight Rises in London on Wednesday (18Jul12) and went out on the town following the movie, mingling with pals at an afterparty before heading to a West End nightclub.

Now it has emerged the third-in-line to the throne was seen dancing and chatting with Cressida Bonas, the daughter of entrepreneur Jeffrey Bonas and Lady Mary-Gaye Georgiana Lorna Curzon.

A source tells British newspaper The Sun, "At one point he was sitting down playing with her hair before finally leaving just after 4am."