Katy Perry: I’m stress eating

Katy Perry has been "stress eating" as she tries to wrap up filming for her 3D film.

The 27-year-old has been shooting Katy Perry: Part of Me, a movie which chronicles her life and concerts. But it seems she has been turning to junk food as she worries over the production of the movie.

"Devouring a papa johns pizza, garlic sauce dippin'. I think this is what they call stress eating #gottafinishthisfilm #KP3D (sic)," she wrote on her Twitter page.

Katy has plenty on her plate at the moment with her film, concerts and promotion of her new music. She is also reportedly set to add to her workload as a judge on the UK version of The X Factor. The Fireworks star is said to be replacing Kelly Rowland on the panel of the talent show.

Work is not the only thing that seems to be plaguing Katy's mind. She is also concerned about her friend Jessica Simpson's pregnancy. The star is due to give birth to a baby girl with her fiancé Eric Johnson any time soon.

"Has Jessica Simpson had that baby yet?! I'm getting anxious (sic)," Katy tweeted.