Kate Beckinsale Style Pictures

Kate Beckinsale is gorgeous, sure, and she makes a red carpet gown look good, but when you really think about it, it's her consistently laid-back, comfortable off-duty style that really makes the biggest impression on us. But once a bombshell, always a bombshell: she gives baggy boyfriend jeans and sweatpants the same sultry vibe that a body-con cocktail dress would elicit.

In honor of Kate's 42nd birthday — we're currently trying to locate her personal fountain of youth, because she has to have one, right? — cruise through to gather day-to-day dressing inspiration from the street style ace.

— Additional reporting by Marina Liao