fashion week Kristin Cavallari jacket blonde

Kristin Cavallari was snapped arriving at New York's JFK airport last night, and we still can't believe she's pregnant! Not just because there's no visible signs of a bump, but she's so young!

The 25-year-old former Hills hottie attended the Rachel Roy fashion show this morning, and it sounds like she's having a blast on the east coast. "The Dream hotel is amazing," she tweeted. "U should stay here when ur in NYC."

She's not rocking maternity clothes just yet, but we're sure KC will impress us with her wardrobe once she starts showing...