Paris Hilton's Sis Shows Her Sexy Side

(AP)  Socialite turned designer Nicky Hilton debuted her fall 2008 collection titled Nicholai Tuesday night at Culver City's Smashbox Studios.

As part of the week's celeb designers, Nicholai displayed leather trenches, wool tweed blazers, pleated bow dresses, and patent leather patchings.

"The inspiration for the season was equestrian meets bondage," noted Nicky Hilton. "So a lot of tailored equestrian looks but I wanted to sex it up a bit and not have it look so nice. Add a little naughtiness. There's a lot of patent leather, buckles, latex leggings. It's definitely a chic, sexy vibe."

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Photos: Nicky Puts On A Show

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Last season, sister Paris Hilton was unable to attend the show. This year she arrived early with boyfriend Benji Madden. Nicky told AP Entertainment both sisters are each other's biggest fans.

"I'm so proud of her. My sister is an incredible designer. I love the line," smiled Paris Hilton. "I'm wearing it right now. She just knows what she's doing. She loves fashion. Ever since she was a little girl I always knew that she would be doing something good in the fashion industry. Just to be here today, it's my first time seeing her show. I'm going to be crying in the audience all excited for her, with my mom."

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Photos: Paris Hilton

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As soon as the show ended, Paris and Madden left promptly leaving mother Kathy Hilton behind to talk to the media.

"Paris was never quite as in to (fashion)," noted Kathy Hilton. "Paris was always running around in one of the little mermaid costumes when we would come out, 'We're going to the market. Get your little mermaid costume out.' Paris is completely different and Nicky was always a little more conservative and tailored. But that makes it exciting now, it can't all be the same."

Nicky debuted the more-expensive Nicholai line at New York Fashion Week last year. She launched her first clothing line - the casual Chick by Nicky Hilton - in 2004.