Taylor Swift pulled a fast one on her concert mate Keith Urban Saturday night.  The set list has Taylor and her band joining Keith on stage for his mega-hit Kiss a Girl.

Last night at the Sprint Center in Kansas City, she and her back-up guys were all costumed as the rock band KISS!

“Pranking is a must,” Taylor Tweeted afterwards.  “How about rushing his stage during ‘Kiss a Girl’ dressed like this? It went down.”