Katy Perry shares unrecognisable throwback teenage picture

Katy Perry has shared a fresh-faced, throwback picture of herself as a 13-year-old girl.

The Firework singer took a trip down memory lane when she took to Instagram on Saturday (9Sep17).

The 32-year-old popstar posted a snap on the social media site of herself when super stardom really was just a Teenage Dream.

In the picture, an almost unrecognisable 13-year-old Katy can be seen singing into a microphone with headphones on.

Her hair is dark blonde and cut into a short bob and she is dressed down in a grey sweater and blue denim jeans secured with a dalmatian print belt.

The Swish Swish songstress labeled herself a "wannabe singer" alongside the snap. Fans went wild with almost a million likes within the first 24 hours of the post.

Fans commented on how her dreams had come true and how different she looked back then.

The picture, taken 19 years ago, was before Katy took the last name Perry and went by her real name of Katy Hudson, which she changed avoid to confusion with actress Kate Hudson when she signed her first major record deal.

The Chained to the Rhythm hitmaker is just about to embark on WITNESS: The Tour which starts in Montreal on 19 September (17).

The tour was originally due to start 12 days earlier but due to production delays, shows in Columbus, Quebec City, Toronto, Buffalo and Philadelphia were postponed.

Katy will be joined by support acts Noah Cyrus, Purity Ring and Carly Rae Jepsen on the North American leg of her tour.