London: Pop star Katy Perry has unveiled a cover artwork for her song `Birthday` from her album `Prism`.
The `Birthday` song was co-written by Bonnie McKee and was co-produced by Dr Luke and Max Martin in 2013, reportedly.
The 29-year-old `Roar` hitmaker tweeted, "I present the cover of my next single," while uploading an old picture of her and her older sister Angela Hudson with a birthday cake in front of them.
The singer is preparing to head over to the UK next month.
She will be seen performing during her `Prismatic` world tour on the road