Rachel McAdams dating Michael Sheen?

Hot new couple alert! The A-list pair were spotted holding hands in Toronto after meeting at a film party

Hot new couple alert! The Hollywood rumour mill has swung into overdrive, following rumours Sherlock Holmes beauty Rachel McAdams could be dating actor Michael Sheen.

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The pair were attending a bash for the Welsh actor’s drama Beautiful Boy when they were spotted getting cosy, with onlookers saying the smitten couple didn't leave each other's sides all night.

The A-listers have also been spotted hanging out in Toronto, holding hands and laughing during a super-secret date, according to Canada’s National Post.

One excited fan even spotted the couple cosying up during brunch together and told the paper, 'their happiness is making my day'.

Since her romance with Notebook co-star Ryan Gosling, Ms McAdams has been linked to a string of eligable Hollywood batchelors, including Midnight In Paris love interest Owen Wilson.

Previously, Michael dated british beauty Kate Beckinsale, and the pair have a daughter, Lily, 11.

What are your thoughts on Hollywood's latest hot hookup? Let us know in the box below. HOTTEST HOLLYWOOD HOOKUPS SCANDALOUS CELEBRITY AFFAIRS