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Ed Sheeran

Winkelmeyer/Getty Images for EB Kids

UPDATE: E! News has learned that Ed Sheeran has been sued yet again, this time for his hit "Thinking Out Loud."

Marvin Gaye and Ed Townsend co-wrote the 1973 classic song, "Let's Get It On" and now Townsend's heirs are suing the pop singer for copyright infringement. Sheeran's team has yet to return request for comment.

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One of Sheeran's chart-topping tracks is currently under hot water.

The Grammy-winning singer has been hit with a lawsuit by Martin Harrington and Thomas Leonard, and their publishing company HaloSongs, who allege that Sheeran's "Photograph" is a copy of their 2009 song "Amazing."

Harrington and Leonardo's single was sung by Matt Cardle, the winner of the 2010 season of The X Factor.

The plaintiffs are currently being represented by Richard Busch, the same attorney who represented the Marvin Gaye family during their recent lawsuit over the single, "Blurred Lines."

E! News has obtained the court documents, which claim that "the songs' similarities reach the very essence of the work. The similarities go beyond substantial, which is itself sufficient to establish copyright infringement, and are in fact striking."

The complaint adds that "the similarity of words, vocal style, vocal melody, melody and rhythm are clear indicators, amount other things, that ‘Photograph' copies ‘Amazing.'"

Busch told NBC News, "My clients are professional songwriters. Their work is their life and I am honored that they have trued me with this very important case. We set out the facts in the lawsuit in great detail."

The plaintiffs have estimated that the defendants (including Sheeran) have profited over $20 million, and they are seeking statutory damages as well as either a running royalty or an injunction.

Sheeran's rep could not be reached for comment.

(Originally published on June 8, 2016, at 1:46 PM PT)