Beyonce and Jay-z attended Britney Spears show in Las Vegas.

Beyonce and Jay-z were spotted this weekend at the Planet Hollywood Resort and Casino in Las Vegas to attend Britney Spears 'headlining residency show. 

According to sources no one had any idea the power couple were even attending. It also been said that no sooner Britney took the stage, Beyonce was spotted singing along to several of Britney's songs and having a blast.

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