"She's All That" is one of the great romantic comedies of the late 1990s, grossing more than ten times its budget at the box office. It was a great vehicle for Freddie Prinze Jr. and Rachael Leigh Cook, and had clearly been written by someone with a great eye for how relationships work when you're at high school. What either the writer or the director was less clear on was how tattoos work.
Early on in the movie, we see Cook, playing Taylor, getting a heart tattoo on her shoulder - something which was quite edgy at the time. By the time we reach the climax of the movie and she gets to the prom, the tattoo has disappeared. Either Taylor has the kind of makeup that a professional makeup artist would be proud of and she's managed to cover it up completely, or whoever filmed that scene hadn't been paying attention to the first half of their own movie.