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In New York to launch her new clothing label Twenty8Twelve, Sienna wears a sexy fiery red top teamed with skinny high-waisted jeans and Christian Louboutin strappy sandals.
Want to steal her style? We've done your homework for you.
Red leotard, £19, American Apparel, call 020 7734 4477 or visit www.americanapparel.co.uk
High-waisted jeans, £40, Oli, call 0844 5665654 or visit www.oli.co.uk
Leopard-print scarf, £15, Oceanic, call 020 7437 8438
Black shoes, £110, Topshop, call 0845 1214519 or visit www.topshop.co.uk