If you thought Mary-Kate Olsen knew exactly what dress to wear for her upcoming wedding to Oliver Sarkozy, think again!

She recently joined forces with twin sister and design partner Ashley Olsen to make a dress for their good friend's nuptials, but she has not yet decided what to do for her own special day.

"I'm, like, not even there yet," she told WWD. "I think it may be a matter of getting five or six, or making two or three and being stressed out. That seems kind of far away. We'll take one step at a time."

The former child stars just opened their first shop for label The Row in their hometown Los Angeles, as opposed to their "adopted" city of New York.

"We've always wanted our own store; it's always been part of the plan," the bride-to-be said. "It was a toss-up between New York and LA, and when this space became available, we jumped on it. It used to be a hair salon and my sister and I used to come here, so we were very aware of the space."

Her sister agreed, saying, "We are from here, and The Row started here, so it was all very appropriate."

They also revealed their plans to take things slow with their brand.

"What's more important to talk about is that every step is really imperative to the brand and we don't like to do everything at once," the star continued. "We'll get into e-commerce sooner than later, but we want to make sure we do this right first. We will get into shoes in the next year. And hopefully men's. To us it's really about a lifestyle, and I think this store is a great starting-off point to express where we are going."

The younger twin announced her engagement to French banker Sarkozy in March after a long-term relationship. The Daily Mail states his half brother is former French president Nicolas Sarkozy, and he has two children from a previous marriage.

Do you think Olsen will design her own dress? Let us know your thoughts in the comments section below!