Arcade Fire frontman Win Butler will join the Rolling Stones onstage at their concert Sunday night at Montreal's Bell Centre. Butler is the latest in a series of genre-crossing artists who have joined the legendary rock band on their current tour.

The Stones first posted the news on their Twitter account earlier today. Butler followed the news with a similar update on his band's Twitter.

Last year, Arcade Fire backed Stones frontman Mick Jagger when he hosted the season finale of 'Saturday Night Live.' They played the old Stones song 'The Last Time.' But there's no telling what song Butler will perform with the full band when he joins them onstage this weekend.

So far, the guests on the Stones' 50th-anniversary tour have been pretty diverse -- running from Katy Perry (who sang 'Beast of Burden' with them) and Dave Grohl (who performed 'Bitch') to Tom Waits ('Little Red Rooster') and most recently Taylor Swift ('As Tears Go By').

So chances are pretty good Butler and the band will perform one of the Stones' classic cuts rather than, say, 'Neighborhood #3 (Power Out)' or 'We Used to Wait.'