Las Vegas went crazy though.
Britney had a surprise in store for fans attending Wednesday's Piece Of Me show – an onstage cameo with Tinashe for their reworking of "Slumber Party."The two joined forces to strut down the catwalk and execute some stylized choreography.
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When the number was up, Britney told the crowd to give it up for... TinashE! As in, she pronounced her name correctly this time (although Tinasha was becoming iconic).
Watch the fan-filmed performance below:
They also switched out "Radar" for "Change Your Mind" during one of the interludes.