Watch footage now.
Muse shocked the thousands in attendance at Reading Festival just hours ago by bringing out AC/DC frontman Brian Johnson on to the stage during their encore.
As NME reports, Muse's Matt Bellamy introduced the revered singer to the crowd, saying "He's back!" before tearing into a performance of AC/DC's Back In Black, led by Johnson.
The showing marked one of Johnson's first since he was forced to pull out AC/DC's world tour last year due to hearing issues.
Check out a snippet of the performance below.
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Meanwhile, Muse are confirmed to be heading to Australia this December for two massive arena concerts; click on theGuide for more details.
@Muse promised us special guests and boy did they deliver!#ReadingFestival pic.twitter.com/Y2qXuQeV8g
— BBC Music (@bbcmusic) August 27, 2017