But while promoting her new movie A Simple Favour, the 30-year-old has come up with a uniform of sorts, wearing nothing but power suits for seven days straight.
From neon green to blue velvet and purple linen, if it's a suit, Blake's probably worn it.
While power suits are undoubtedly having a moment, a la Hillary Clinton, Blake is clearly doing more than just ticking off a trend.
So what's it all about?
As pointed out by The Cut, the actress' upcoming film is about a mummy vlogger (Anna Kendrick) whose best friend and fellow mum, Emily Nelson, disappears.
In the trailer for the black comedy, Emily (Lively) is seen wearing a lot of pantsuits, which is likely why Blake has been ditching the dresses and opting for two-piece suits.
It's not the first publicity stunt Blake has pulled for the new film, either. Back in May, she deleted every Instagram on her account, unfollowed all her friends (and husband, Ryan Reynolds), and started following users named Emily Nelson.
In conclusion? Given all the hype, velvet and neon, this flick better be good.