Fans of the American singer, Demi Lovato performed a mass sing-along after the star postponed her gig at O2 in London due to illness. Disappointed fans decided to try and cheer their favorite star with a song. A fan tweeted, "MASS SING ALONG AT THIS SPIKE AT HALF 7 O2 ARE GOING TO TWEET IT TO DEMI @ddlovato @o2 come cheer yourselves up." Another fan tweeted, "#o2demisingalong LOVATICS ORGANIZED A SING ALONG FOR U WE LOVE YOU."

"So this just happened outside the O2! I'm the one holding the 'O2' sign?? #O2DemiSingALong." Lovato thanked her fans as she wrote, "My fans are seriously the best... I can't believe how much love and support I've received today.. the video of my fans singing skyscraper outside of the venue made me cry."