Thompson and Firth poses for crowd

Colin Firth and actress Emma Thompson greeted an awed crowd at London's Leicester Square. Picture / Herald file

Emma Thompson and Colin Firth left crowds spellbound at the premiere of their new movie Nanny McPhee.

The actors wowed fans gathered in London's Leicester Square, performing the now-obligatory walkabout to greet the hundreds outside the cinema. Thompson looked stunning in a blue dress by designer Tashia and Jimmy Choo shoes.