We already know Olivia Wilde [1] is a pretty cool mom. The style setter, who's mother to 2-year-old Otis, is known for rocking killer vintage t-shirts and is just as adept at pulling off the sexiest kind of gown — and it makes her one of the most exciting actresses to follow from the street to the red carpet. And with the announcement of her second pregnancy [2], we don't expect her fashion game to change all that much, especially since we've already spotted Olivia rocking her budding bump in a cool-girl bikini and a pair of overalls — and of course, since the style through her first pregnancy was [3], well, pretty chill. Just read on to get your first taste of her new maternity style and tell us that's not one cool mom.

The style star proved that overalls make a pretty sweet cover-up while vacationing in Hawaii at the start of her pregnancy.

She accessoriezed the look with a pair of cool-girl shades.