Katy Perry destroyed a 5-year-old kid's birthday party to film scenes for her new music video

Katy Perry made children cry after gatecrashing a five-year-old's birthday party. awwww . (I bet that wasn't her intent )

The Dark Horse hit-maker dressed up as a clown for the video for her track Birthday and carried out a prank at a party, where she attacked a man with a piñata stick and staged a car accident, but the spoof incident left children in tears.

Eye witnesses told TMZ that Katy pranked a real birthday party and most of the guests had no idea it was a joke.

Children were crying and one woman "stormed away" visibly upset by her antics.

A teaser for the video: The hidden camera gag was shot at Knollwood Country Club outside Los Angeles and a video obtained by the website shows one little girl saying, "Mommy, I want to leave."

During an interview on Jimmy Kimmel Live, Katy spoke about going "undercover" at the bash, but didn't mention the fall out.

Speaking earlier this week, she said: "I just did a music video completely undercover as five of the world's worst birthday entertainers, because I was sick of making gorgeous music videos where I'm sexual."

Jimmy joked: "People are sick of that, yeah, really tired of looking at you." ( like seriously , who gets tired of looking at Katy, that person must have a disorder , even the Lion in her "Roar" video was spell bound )

The Kimmel interview:
  Katy, 29, then previewed a clip of the video which sees her dressed as a clown drinking and burping, saying: "I'm not really a birthday party entertainer, I'm just trying to get some cash on the side,'' adding, ''Happy birthday kids."

Watch the TMZ footage here.