'Till The World Ends' superstar Britney Spears has been forced to axe her weekend concerts in Las Vegas after sustaining an injury. 

The beauty took a tumble while performing her hit single '(You Drive Me) Crazy' during her Piece of Me residency at the Planet Hollywood resort in Sin City, and in video footage posted online, she struggled to get back up and needed the assistance of her dancers.

Writing on Twitter this morning (May 1), Spears admitted that she has to cancel her forthcoming weekend performances in order to make a speedy recovery that won't interfere with further shows:

"Breaks my heart to share this news. After hurting my ankle last night my doctor has advised me not to perform this weekend #Heartbroken. Your kind words mean everything to me! I'm rescheduling this weekend’s shows and will let ya'll know when we have the new dates."

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