Katy Perry has released the cover art for her new single, Birthday.

The Roar singer tweeted out an image of the cover art which features a very young Katy in a flower patterned dress wearing a big bow in her wavy blonde hair.

The singer is sitting beside her sister Angela Hudson, who is posing adorably in the snap while Katy looks a little fed up.

The singer tweeted the cover art image along with Thursday’s famous throwback trend: “In honour of #TBT may I present the cover of my NEXXXT single.”

Katy says she is preparing for her Prism World Tour which starts in Belfast and she plans on making it the best tour yet.

“I’m very excited because I believe this is my best work yet as far as live performances. It’s going to be just as colourful and fun as before, but it’s obviously not based on candy. It’s grown up. It’s more mature.”