Olivia Colman, Robbie Williams and Benedict Cumberbatch set to appear on Celebrity Apprentice

The BBC's upcoming 'Celebrity Apprentice' has some big Hollywood names lined up for a special task.

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Olivia Colman, Benedict Cumberbatch and Robbie Williams are reportedly set to appear on 'Celebrity Apprentice'.

The two Hollywood actors and 'Angels' hitmaker are said to be lending their star power and expertise for a task on the upcoming BBC special, with the famous candidates tasked with bringing an A-list pal to help them.

An insider told The Sun newspaper's TVBiz column: "Lord Sugar’s celebrity Apprentices were already an impressive bunch but the extra names featuring in one surprise task have considerably upped the ante.

"Benedict and Olivia are both huge names and of course are beloved by fans so everyone was very excited when the candidates mentioned they would be calling on the duo for help.

"The starpower is off the scale.”

Other big names said to joining the fold to help out with the task include Rylan Clark, Dermot O'Leary, Gary Lineker, Craig David and Tom Grennan.

Earlier this month, it was reported that the 12 celebrity candidates include Rob Rinder, JLS singer JB Gill, Angela Scanlon, Jake Wood, 'Gladiators' star Legend (Matt Morsia) and comedian Shazia Mirza.