Beyonce shocked crowds at the 2014 Coachella music festival in California by joining her sister Solange Knowles onstage.
The Irreplaceable singer appeared unannounced at the end of her younger sister's track Losing You to perform a choreographed dance routine with her.
Beyonce's unexpected appearance at the Empire Solo Club in Indio on Saturday night (12Apr14) was very brief, and once the song finished, she hugged her sister and left the stage.
The second day of the festival was full of more surprise appearances. Happy singer Pharrell Williams brought out a number of famous friends during his set at the Outdoor Theater.
Rapper Nelly joined him for a rendition of his single Hot In Herre, Busta Rhymes rapped Pass The Courvoisier Part II and Snoop Dogg performed Drop It Like It's Hot and Beautiful. Rapper Tyler, The Creator and dance act Diplo also joined the show.
However, the biggest surprise of his set was the introduction of Gwen Stefani, who performed her 2005 hit Hollaback Girl, which she co-wrote with Williams.
British band Muse closed the second night of the festival on the Coachella Stage with a 14-song set, which included a cover of Nirvana's Lithium, which they dedicated to the band's lead singer Kurt Cobain, who died 20 years ago.
The second day of the festival also featured sets from rockers Queens of the Stone Age, pop star Lorde, electro act Pet Shop Boys and British DJ Fatboy Slim.
Others due to perform on Sunday (13Apr14) include Arcade Fire, Motorhead, Lana Del Rey and Calvin Harris.