Yo ho yo ho,My Sinful Valentine XXX it's apparently going to be a pirate's life for McCartney!

Paul McCartney -- yes, Sir Paul McCartney from The Beatles, that's the guy -- on Saturday posted a photo of his Pirates of the Caribbean: Dead Men Tell No Tales character, which was announced last March.

McCartney will be starring in the upcoming Pirates of the Caribbean: Dead Men Tell No Tales. Yeah, no -- we have no idea why or how this is happening either. But it's happening.

A 74-year-old McCartney posted a promo poster for the fifth Piratesfilm that shows him looking remarkably like his now co-star, Johnny Depp. McCartney's pirate hair, beard, makeup, bandana, hat, rings, AHH this man is almost unrecognizable.

What is going on?

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According to IMDB, the singer will be playing "Jail Guard 2," which doesn't tell us much. [Mashablesaw the film at Cinemacon and, while we don't want to spoil anything, the truth is there's not much to spoil. The appearance is so brief that you could tip a rum bottle and miss it.]

Though this casting seems slightly out-of-the-blue, Rolling Stones guitarist, Keith Richards, appeared in the franchise's third film, Pirates of the Caribbean: At World’s End, so this is apparently a thing classic rock stars do?

Richards played the role of Captain Teague, Jack Sparrow’s father, which must have been a joy for Depp, who based his character's mannerisms after Richards.

Even so, we honestly just have so many questions -- mainly:

• Has Paul been dreaming of starring alongside Johnny Depp as Captain Jack Sparrow for YEARS and we just never knew?

• How is there even a fifth installment in the Piratesfranchise anyways?

• Is this cool? This is a man who recently collaborated with freaking Kanye West and Rihanna on "FourFiveSeconds," so it must be, right?

• Why, Paul? WHY are you doing this? Tell. Us.

The film is set to come out on May 26, so it's not long before we get our answers.