The singer-turned-fashion designer is set to marry fiancé Eric Johnson later this year, but said that she still needs to decide what she is going to wear.
'I don't have a dress yet,' the 31-year-old told Extra. '[But] the dress is going to be amazing.'
She said that she is happy to take the planning in her stride, having done it all before when she married ex-husband Nick Lachey in 2002.
'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.'
Talking about her role as a mentor to aspiring designers on upcoming NBC show, Fashion Star, she said it was a 'dream come true'.
Asked if she ever thought that she would become a fashion mogul herself, she admitted, 'Absolutely not. 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.'