According to Yahoo! news, the Hadouken meme -- which was inspired by the "Street Fighter" videogame -- was created by Japanese schoolgirls and consists of posing for photos "as if they were carrying out special-effect attacks on opponents in a video game."
Though Alba's photos have been up on her Instagram page for a while, they went viral on Thursday. Here's a few of them.
Swim Week Miami Beach 2014 [PHOTOS]