She’s Beautiful. Who Is? The Girl Reading This is a phrase featured in image macros intended to surprise a girl seeing the image by breaking the fourth wall and calling her beautiful. It became the subject of ironic iterations in the mid-2010s due to its cringeworthy nature.
The phrase has appeared in various iterations for several years. For example, an image employing the concept was tweeted on June 5th, 2012 by @RileyRainbow01 (shown below).