Katy Perry Wears Crazy Disguises, Pranks Lots of People in 'Birthday' Music Video - Watch Now!

Katy Perry wears a variety of crazy disguises including an old dancer, a wildlife expert, a clown, and an entertainer to attend birthday parties undercover in her new music video for “Birthday.”

“GUYS, PREPARE YOURSELVES cuz it’s time to bring out the big balloons and #MakeItLikeYourBirthday!” the 29-year-old entertainer tweeted right before releasing the video.

The video starts out by saying “In April, 2014, Katy Perry attended 5 birthday parties…Only no one knew it was her.” What a funny trick!

Check out the video below, and sound off in the comments about your opinion on Katy‘s big prank!