Katy Perry feels "fat" when she doesn't wear control pants.
The singer is often hailed as one of the hottest ladies in showbiz, but Katy doesn't feel so comfortable in her own skin.
The Firework singer attended the UNICEF Snowflake Ball in New York City this week, clad in a gorgeous sheer Naeem Khan dress.
Despite looking stunning, the 28-year-old couldn't stop worrying about her weight.
"I feel like my [fat] is sticking out so bad right now," she admitted to Us Weekly at the party.
"I almost always wear [Spanx], but not tonight, and I feel it pushing out, making me look fat."
The floorlength dress Katy wore to the bash showed off her curves perfectly and looked amazing accessorised with Giuseppe Zanotti heels and a Judith Leiber clutch.
Whereas her figure looks like it would take a lot of hard work to achieve, the singer doesn't do as much exercise as she should.
"I like to say I run on the elliptical for 30 minutes watching CNN, but I don't do it often enough," she confessed.
"So I'm just like, 'Oh, I guess I'm not fitting into this Lanvin dress for these couple of months.'"
Katy isn't just a hit in the music industry; she's also taken the beauty world by storm with successful fragrances Meow! and Purr.
Now it has emerged she will be collaborating with perfume powerhouse Coty, who are responsible for Calvin Klein and Marc Jacobs fragrances.
"I am honoured to be working with Coty, which has produced some of my favourite fragrances," she said of the new project.
"I'm excited to share what's next in my perfumed world as well as making Purr and Meow! more accessible worldwide!"
Details about the fragrance haven't yet been released but the president of Coty Beauty, Renato Semerari, has hinted it will be "original and daring".
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