06/01/2007 at 04:20 PM EDT
Three years after Sex and the City, Sarah Jessica Parker
is making a (small) return to the spotlight with her new clothing line, Bitten, which hits the budget fashion chain Steve & Barry's on June 7.
On the heels of the line's launch, Parker, 42, talked to PEOPLE about her 10-year marriage to Matthew Broderick, answering 4-year-old son James Wilkie's tough questions and more.
You've been offered design jobs before. Why take this one, for a budget chain?
It always seemed very unsavory to ponder a real design job. I don't sketch. I don't know how to sew. But I am acutely aware of what it means to not have the things you need, let alone the things you want. And you should be able to have affordable, quality fashion.
Every piece from your line is less than $20 – but if a woman's going to splurge on one item, what should it be?
I tend to be someone who splurges on shoes. I know a lot of people splurge on decorative jackets, but I don't because I don't look good in them. I've got too much hair, and I don't know how to pull it up myself to get it out of the way of the jacket!
What did you learn, style-wise, from being on Sex and the City?
That there shouldn't be rules! I always believed in hard-core aesthetic rules – "No white after Labor Day." And I matched, because I thought that was ladylike. I matched my clothes my whole life – at least until [costume designer] Pat Field got ahold of me!
James Wilkie is 4 now. Has he begun asking tough questions?
He goes to school with a lot of kids who have different families from his, so he'll be like, "Jen has two mommas" or "Charlie has two poppas." And so we've been talking about what it is to be gay; I want him to understand it in terms that aren't overwhelming to him. But he asks about everything. Death is a very big conversation piece.
Do you have trouble explaining these things to him?
Actually, the things that are far more complicated for me to answer are any kind of science questions. He has a really keen interest in science. I have basic fundamental knowledge – but I don't know what he's going to do about homework! I'm glad my husband's smart about that sort of thing.
Your 10th wedding anniversary was May 19. How did you celebrate?
In a private way! He did write me a card, and I didn't have to ask, which was really nice. He's been shooting a movie, so he's not been around much, but we had a great, great anniversary.
In Hollywood 10 years is a big deal, so congratulations.
I know! And it's 15 total [since we met]. I'm really shocked! Not because I'm shocked that we lasted—it's just a lot of years. You can't stop time!