Credit: Steve Granitz/

Jessica Simpson hasn't said yes to the dress!

In an interview with Extra, the 31-year-old fashion mogul admitted she hasn't decided on the gown she'll be wearing on her wedding day.

"I don't have a dress yet," she said. "[But] the dress is going to be amazing."

Simpson, who first said "I do" to Nick Lachey in 2002, is laid-back about her upcoming nuptials to Eric Johnson. "I'm not a bridezilla," she said. "With a wedding, it should be a celebration! We should all be having fun -- every single person there… It's not just about making everybody happy. Eric and I are the ones that deserve all the happiness in the world."

Part of why Simpson hasn't focused more on planning her wedding? She's been "super-focused" on her upcoming NBC show, Fashion Star. She described being a mentor to aspiring designers as "a dream come true." 

So did she think that one day she'd be running her own fashion empire? "Absolutely not," she exclaimed. "I mean I started off with accessories -- I started off with shoes. Shoes are my best friends, so it's a good thing we have a great relationship. I'd rather have a great pair of high heels than a hug."