But the letter has sparked outrage among social media users who believe Brexit is the best ay forward for the UK.
One Twitter used said: “Haha! Cumberbatch, Knightley & other politically correct, Leftist luvvies actually think we give a f*** about their views on the EU.”
Paul Henri Cadier said: “Celebs urge UK to STAY in EU in desperate open letter to protect their life-style at the expense of the rest of us.”
Meanwhile, Jessica tweeted: “More rich, overpaid people beg us in another sad, pathetic, desperate attempt to get us to vote remain.”
Twitter user Mark added: “How many of you lovies have migrant neighbours, compete for jobs with migrants earn minimum wage? None.”
Jeremy Diamond said: “What a bunch of f***ing losers. Britain should be subservient to Europe because they fund their movies?!”