"I'm definitely not going to get married in latex," she tells PEOPLE of one rampant rumor. "When I wear latex onstage, I sweat. I could wring out those dresses – and I don't want to do that at my wedding."
The singer, 25 – whose second album, Teenage Dream drops Aug. 24 – does, however, use her wardrobe to communicate her feelings about her fiancé.
In June, she wore a half-U.S., half-U.K. flag to represent her union with the British actor-comedian.
"I feel very divided," she says. "I'm half American and half English, in a way. I thought it would be fun to make a what-I-feel dress."
Then, there's the what-she-feels new album. "I love putting my emotions, relationships and convictions into lyrics," says Perry. The new single, "Teenage Dream," "is a love song," she says. "There's nothing like your first love."
"When you get older you can be guarded because you've been hurt," adds the singer. "When you're a teenager, it's all or nothing. All bets in."
For more on Katy Perry, her upcoming wedding, and her fiancé, pick up PEOPLE on newsstands Friday