Johnny Depp became a surprise guest guitarist for rocker Marilyn Manson's Halloween night concert at the Roxy Theater in Hollywood.

Although Depp, 51, had played with Manson in the past, the actor surprised the audience when he arrived on stage - perhaps because people were expecting he should be somewhere else.

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Johnny Depp played the guitar for Manson's hit, "The Beautiful People," on Friday, where Ninja from the group Die Antwoord also joined, spending most of the performance crowd-surfing.

Here's the video:

Depp has been performing intermittently as a guitarist since the 1990s and have had concerts and recording sessions with Oasis, Shane MacGowan, and others. In 2012, after playing lead guitar and the drums for "You're so Vain" on Manson's album, Born Villain, the "Pirates in the Caribbean" star joined the hard-core rocker in a live show at the Revolver Golden Gods Awards.

But movie audiences need not worry. He's not about to say goodbye to acting in the movies. In fact, he is so in demand that he has already racked up four films for release in 2015 and into 2016. In the next few months, Johnny Depp will be appearing in "Into the Woods" as Big Bad Wolf, and in "Black Mass" as Whitey Bulger.

Manson, 45, whose real name is Brian Hugh Warner, will be busy as well in 2015 as he expects to release his next album.

He's had acting gigs, too, in "Once Upon a Time" and in "Sons of Anarchy."

TagsJohnny Depp, Marilyn Manson