She may still be releasing tracks off Teenage Dream thanks to her latest single, [article id="1670723"]"The One That Got Away,"[/article] but Katy Perry is already hard at work on some other super-special, top-secret musical project.

Producer Tricky Stewart, who worked with Perry on three Teenage Dream songs, is back at work with the California Gurl herself, prepping some music with the singer. "Katy and I went into [the studio] just to address some issues with records that we had done in the past that didn't end up going on Teenage Dream," he told MTV News. "So we are in the process of just listening and freshening up things and getting ready for something special she has going on."

What is it that she is readying? Well, Stewart doesn't exactly know, or maybe he just doesn't want to say. "I don't know what it is, but I know she has something going on because she wants to be in the studio," he said. "So that's good. ... I can tell you that Katy likes the studio again; that's always a good thing."

While he couldn't shed much light on the project itself, he did reveal the name of the song. "This song is really special. It's called 'Dressing Up,' so it's going to be a big record, I think," he said. "It definitely fits. It's right there in what her sensibilities are as a musician and a songwriter. She doesn't change much. She has a very keen musical taste. It'll be really good."

The music they are working on is using some leftovers from their Teenage Dream sessions. And they hope to finally put that magic out into the world. "We always knew that the records we created were special [and] at the time it was more contractual obligation [that they didn't make the record]," he explained, noting all the success the singer has experienced with the record, which includes [article id="1669214"]five #1 songs[/article]. "I can only have so many songs produced by me on the record. She didn't need to have extra songs at the same time."