By Jessica Derschowitz
Updated April 06, 2016 at 03:29 PM EDT
Dimitrios Kambouris/Getty Images

Blake Lively’s latest look is sure to enchant Harry Potter fans everywhere.

The actress posted an Instagram photo Tuesday proving she wears her Potter fandom on her sleeve — and her nails.

“I solemnly swear that I am up to no good,” she wrote, displaying the sign of the Deathly Hallows on her manicure.

We think it’s manicure mischief very well managed.

Lively will appear next in The Shallows, out June 24.