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Paris Hilton and fashion go hand in hand, and the heiress is proving it while in New York promoting her iPhone app. She must have filled an entire plan with her luggage!

The 30-year-old reality star celebrated her birthday in style by making the rounds on the NYC talk shows ... including Letterman and the Wendy Williams Show.

When Letterman asked Paris what she has in store for the future, she replied, "Just continue doing my business and growing my empire and have kids."

Way to be direct, Paris. Looking at how gorgeous she is in all of these outfits, Cy is one lucky guy! Let's hope an engagement ring is coming soon for Princess P.

See Paris and Cy share a romantic smooch ... after the jump.