Now we know: The Best Picture Oscar debacle was the accountants' fault

Warren Beatty, you're off the hook.

You too, Faye Dunaway. And to La La Land producer Jordan Horowitz: You handled this as well as anyone could have.

The blame for the Best Picture Oscar snafu has finally been owned: PricewaterhouseCoopers, the London-based accounting and "professional services" firm that has handled the Academy Awards winners for years, admitted Sunday night that they messed up.

Beatty was handed the wrong envelope.

PricewaterhouseCoopers' statement, sent to Mashable later Sunday night, reads:

We sincerely apologize to "Moonlight," "La La Land," Warren Beatty, Faye Dunaway, and Oscar® viewers for the error that was made during the award announcement for Best Picture. The presenters had mistakenly been given the wrong category envelope and when discovered, was immediately corrected. We are currently investigating how this could have happened, and deeply regret that this occurred. We appreciate the grace with which the nominees, the Academy, ABC, and Jimmy Kimmel handled the situation.

The key here: There are always two identical winners' envelopes, kept by PwC officials standing on opposite ends of the stage.

Somehow, Beatty — presenting Best Picture with Dunaway — had been given the envelope for Best Actress, which had already been announced as La La Land's Emma Stone moments before. On the other side of the stage, Beatty got handed an identical envelope.

And here's proof:

89th Annual Academy Awards - Governors BallImage: Kevork Djansezian/Getty Images

As anyone would, Beatty tried to roll with it.

He looked over the card two times, then a third. He clearly wasn't sure — it didn't make sense that his envelope said "Emma Stone." And so he showed it to his fellow presenter, Dunaway, who saw the words La La Land.

And, because the clock was ticking, she spoke them.

Check out photos from the embarrassing error

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Best Picture error at the 2017 Oscars
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Best Picture error at the 2017 Oscars

US actor Warren Beatty (C) shows the card reading Best Film 'Moonlight' after mistakingly reading 'La La Land' initially at the 89th Oscars on February 26, 2017 in Hollywood, California.

(MARK RALSTON/AFP/Getty Images)

Host Jimmy Kimmel reacts after the 89th Oscars on February 26, 2017 in Hollywood, California.

(MARK RALSTON/AFP/Getty Images)

The cast of 'Moonlight' and ''La La Land' appear on stage as presenter Warren Beatty (C) shows the winner's envelope for Best Movie 'Moonlight' on stage at the 89th Oscars on February 26, 2017 in Hollywood, California.

(MARK RALSTON/AFP/Getty Images)

89th Academy Awards - Oscars Awards Show - Hollywood, California, U.S. - 26/02/17 - Warren Beatty holds the card for the Best Picture Oscar awarded to "Moonlight," after announcing by mistake that "La La Land" was winner.

(REUTERS/Lucy Nicholson)

'La La Land' producer Jordan Horowitz holds up the winner card reading actual Best Picture winner 'Moonlight' with actor Warren Beatty onstage during the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California.

(Photo by Kevin Winter/Getty Images)

Prior to learning of a presentation error, 'La La Land' producers Fred Berger, Jordan Horowitz and Marc Platt accept the Best Picture award for 'La La Land' (later awarded to actual Best Picture winner 'Moonlight') onstage during the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California.

(Photo by Kevin Winter/Getty Images)

Prior to learning of a presentation error, 'La La Land' producers Fred Berger, Jordan Horowitz and Marc Platt accept the Best Picture award for 'La La Land' (later awarded to actual Best Picture winner 'Moonlight') onstage during the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California.

(Photo by Kevin Winter/Getty Images)

Cast and crew of 'Moonlight' accept the Best Picture award onstage during the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California.

(Photo by Kevin Winter/Getty Images)

Director Barry Jenkins and the cast and crew of 'Moonlight' accept the Best Picture award onstage during the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California.

(Photo by Kevin Winter/Getty Images)

'La La Land' producer Jordan Horowitz (L) holds up the winner card reading actual Best Picture winner 'Moonlight' with actor Warren Beatty onstage during the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California.

(Photo by Kevin Winter/Getty Images)

'La La Land' producer Jordan Horowitz (L) announces the actual Best Picture winner as 'Moonlight' after a presentation error with actor Warren Beatty (R) onstage during the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California.

(Photo by Kevin Winter/Getty Images)

89th Academy Awards - Oscars Awards Show - Hollywood, California, U.S. - 26/02/17 - Warren Beatty holds the card for the Best Picture Oscar awarded to "Moonlight," after announcing by mistake that "La La Land" was winner.

(REUTERS/Lucy Nicholson)

89th Academy Awards - Oscars Awards Show - Producer Jordon Horowitz holds up the card for the Best Picture winner Moonlight. At left is Ryan Gosling and right is presenter Warren Beatty who mistakenly announced La La Land as the best picture winner.

(REUTERS/Lucy Nicholson)

89th Academy Awards - Oscars Awards Show - Hollywood, California, U.S. - 26/02/17 - Jordon Horowitz and Jimmy Kimmel react as Warren Beatty holds the card for the Best Picture Oscar awarded to "Moonlight," after announcing by mistake that "La La Land" was winner.

(REUTERS/Lucy Nicholson)

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The rest of that story has been well-documented. The La La Land crew took the stage and began to give speeches — then were told by panicking production crew that they'd actually lost. Moonlight was the real winner.

For the next couple of hours, theories flew: Emma Stone called Beatty's explanation into question. Moonlight director Barry Jenkins said he saw "two envelopes." No one was sure exactly what happened or why.

But now we know: Somehow, someone handed off the wrong envelope to Beatty backstage.

The PwC accountants, whose one job is to get this stuff right, got it wrong.

At least they owned it. Eventually.

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