Rose Byrne Wears Laid Back Plaid Look Perfect For Fall — PHOTO

A new celebrity may or may not have joined the stylish mommy-to-be club. Rose Byrne is reportedly pregnant, US Weekly reports, and she debuted her alleged maternity style in a super cool, laid back look that is a true testament to her signature fashion sense. The news of the possible pregnancy hasn't been confirmed by the couple, but if, in fact, it is true, her impeccable style will translate perfectly into maternity wear, too.

The 36-year-old was spotted at LAX airport on Thursday donning a navy and red plaid dress with thigh-high slits at either side. She paired the loose shirt dress with sheer black tights, opaque sunnies, and black leather chelsea boots with a tiny heel. The coolest part of the ensemble, though, was her use of accessories. The taupe-colored felt fedora with brown leather detailing gave the outfit a cool edgy feel that pulled it all together. It was seriously gorgeous.

I have always been a fan of Byrnes' style. She constantly slays the red carpet game with glamorous, fashion-forward gowns, like this stunning cutout dress she rocked at the premiere of her movie Spy. But the actress knows how to grunge down at the same time, flaunting a chill casual style that somehow still looks pretty and polished.

Take a look at the cool carefree look.

Effortlessly chic.

Here are six celebrities whose maternity style totally ruled. If Byrne is pregnant — now or ever — she should totally take note!

1. Blake Lively

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This is one of my favorite red carpet looks of all time.

2. Kristin Cavallari

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Cavallari wears the chicest threads ever.

3. Kerry Washington

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This is beyond gorgeous.

4. Kim Kardashian

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Kim K doesn't let pregnancy get in the way of her sultry style, and that's why I love her.

5. Kate Middleton

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I don't think anyone's maternity style could be as good as The Dutchess'.

6. Hayden Panettiere

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So adorable.