Jessica Alba -- There's a Nip in the Air!

Even in May, it can get quite nippy out in New York City ... thanks to Jessica Alba.

While she hasn't been on a TV series in years, the sexy 32-year-old mother of two put on quite the show as she stripped off some of her pesky warm layers and exposed one of her gorgeous girls through her sheer bra on Tuesday.

Although unpredictable, the weather forecast did say partly cloudy with a chance of an amazing, beautiful front moving across the land.