Fashionista Sienna Miller has sent the sale of cowboy boots and mini skirts skyrocketing and now she is going to cash in on her iconic status.

Jude Law's on/off girlfriend has revealed that she is starting a fashion line with her sister Savannah that will mix the actresses quirky taste with her siblings designing talents.

The label, "Twenty8twelve", will be launched with an 80-piece collection.

The name is after the style icons birthday on December 28, which the sisters decided upon after ignoring suggestions to self-title the brand.

Savannah said, "People wanted us to put the line in our names, but we wanted it to be more abstract."

"Casanova" star Sienna says the pairing is a perfect match as they are each bringing something to the table.

She said, "I've always loved fashion, and Savannah got a First in design at Saint Martins. We hadn't thought to pursue it together, but this just happened organically."

However, working with a family member can be difficult and cause many catfights but so far so good for the MIller sisters.

Sienna raid, "And setting up a label with your sister is a lot of fun - there haven't been any fights yet...Because of my job, people are willing to invest in the business, but my sister's an incredible designer, and it's a great opportunity for me to work with her."

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