Show host Ashton Kutcher made her think she had ruined Christmas for hundreds of orphans - she was putting a star on top of a 100ft Christmas tree in front of the kids, but it toppled over and crushed hundreds of presents.
The Santa even pretended that someone was trapped under the branches.
Beyonce looked absolutely horrified, but eventually saw the funny side.
Justin Timberlake, Kelly Osbourne and Missy Elliot have also fallen victim to 'Punk'd'.
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not nice Ashton.. [img]graemlins/shake.gif[/img]