A Boston-based filmmaker has proved himself to be a real-life Prince Charming after an inventive proposal to his girlfriend.

Lee Loechler has raised the bar for anyone wanting to propose after recreating his girlfriend's favourite Disney movie, Sleeping Beauty, to include the both of them.

In a video shared online, Mr Loechler can be seen sitting next to his girlfriend Sthuthi David in the movie theatre.

At the end of the movie, Sleeping Beauty starts to resemble Ms David, while the prince looks like Mr Loechler.

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Then the prince pops out a box with an engagement ring in it.

As the film pauses, Mr Loechler takes a ring and turns to his girlfriend.

"I love you with my whole heart, including all of its ventricals, atriums, valves," he says, pausing to explain to the audience that "she's a cardiologist."

He then asks her, "Sthuthi David, MD, will you live happily ever after with me?"

As she said yes, the crowd cheered and the movie song Once Upon A Dream started to play.

Mr Loechler said it took him six months to rework Sleeping Beauty for the proposal.

He also filled the cinema with a mix of friends, family, and seat warmers he found on Reddit.

In sharing the video on Instagram, Loechler wrote, "The only thing better than seeing the smartest person I know completely dumbfounded was knowing we'd get to live happily ever after together."

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The video, which has been viewed 5 million times in YouTube, has made many social media users raise their expectations for any future proposals.