'Captain Marvel' star Brie Larson calls off engagement to Alex Greenwald: report

"Captain Marvel" may be flying solo.

Brie Larson, star of the upcoming Marvel blockbuster, has called off her engagement to Alex Greenwald after three years, reports say.

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"They have taken a step back from their engagement for the time being but they remain close," a source told People on Friday.

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Larson, 29, and Greenwald, 39, got engaged in 2016 after dating for three years.

The actress hasn't been shy about her adoration of the Phantom Planet rocker.

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When accepting her Best Actress trophy at the Oscars in 2016, she said, “Jacob Tremblay, my partner through this in every way possible. My real partner, Alex Greenwald, I love you.”

A rep for Larson did not return Fox News' request for comment on the split news.