Julia Roberts, the titular pretty woman in the film of the same name, joined Instagram only three months ago, but she's a fast learner. Selfies? Nailed 'em. #TBT's? She's got it covered, thanks. Taking down trolls? She's a natural!

Roberts proved her troll-slaying prowess when she oh-so-eloquently took down a hater who had some choice words about the nail polish she paired with her black Dsquared2 dress at the Toronto Film Festival premiere of her latest film, Ben Is Back, on Saturday.

Nicholas Inglis, whose Instagram handle is @thevintagecostumecollector, posted a side-by-side photo of Roberts and Joan Crawford, comparing the two screen stars's LBD style. A follower with apparently deep convictions about nail polish wrote, "Joan Crawford looks way better in my opinion," adding, "Julia is wearing ugly black nail polish!" She didn't. (She did.)

Roberts's manicurist, Mazz Hanna, is probably out there, somewhere, beaming with pride. We know we are.

It is in fact a navy polish with garnets crystals as a grounding accent. In case you would like to edit your comment from 'ugly black nail polish' to ugly navy blue polish with Garnet crystals. Just sayin'
- @juliaroberts

InStyle Magazine