Sienna Miller Romancing Jamie Dornan

Sienna Miller is rumoured to be romancing Keira Knightley's ex-love, Jamie Dornan.The stunning actress - who has been linked to 'Star Wars' hunk Hayden Christensen since splitting from fiancé Jude Law - has allegedly met the Irish model for a string of secret dates.Sienna and Dornan - who split from 'Pride & Prejudice' beauty Keira last year - have reportedly been meeting at London's swanky Electric bar since becoming neighbours in the capital's Notting Hill area.Onlookers spotted Sienna "flirting outrageously" with Dornan, according to a report in Britain's The Mail on Sunday newspaper.One of Keira's pals said the screen beauty will be furious Sienna has the hots for her ex.The source said: "Keira still holds a flame for Jamie."There is every chance that he and Keira might one day get back together, so she will be spitting feathers that Sienna is trying to get her mitts on him."