Asked about the best jewelry her fiancé, actor Josh Duhamel, has given her, she pointed to her engagement ring. "Well this one," she told PEOPLE. "This one is by Duhamel, it's a special stone and that's the most amazing one because it means something."
As for her wedding plans, "I can't talk about it," says the singer, 33, who announced her engagement last December. "I know I have a big mouth, but I can't say. That's the one thing that I have to hold private."
The pop star, who sings "Labels or Love" on the Sex and the City movie soundtrack, has both in her life right now. "I'm designing a new line of shoes so I'm excited about that," she says. "We're working on logos now, I'm really thrilled about that."
And she has plans for a follow-up to her smash solo debut, The Dutchess. What's next? "Getting in the studio," she says, "making new music."