Keira Knightley and Rupert Friend on the rocks?

Keira Knightley’s romance with actor Rupert Friend is reportedly on the rocks.

Friend fueled speculation the relationship is in turmoil after he arrived without Knightley at the ­London Coliseum gala production of English National Ballet’s The Nutcracker.

On Rupert’s arm was his mother, Caroline.

“We all wondered where Keira was, because it was a magical show,” a fellow guest told Britain’s Daily Mail. “But Rupert offered no explanation.”

“Some are saying it could be all over between them,” an insider added.

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