WATCH: Little Mix Reveal Star-studded 'Word Up' Video

Little Mix have premiered the official music video for the Sports Relief single 'Word Up' on YouTube.

The video stars numerous famours athletes, Olympians and celebrities including Melanie C, Chris Barrie, Louis Spence and gymnast Louis Smith.

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'Word Up' is a cover of Cameo's 1986 hit of the same name. The single is due to be released on March 16 but is available to pre-order on iTunes now.

Watch the official music video now: