Like it or not - it's coming up. The dreaded V day where single girls say they "haaaate this day soooo muchhh-uh." Tell them to shut-up. It's a made-up day, anyways. Sort of like their birthday.
Anyway - depending on what "stage" of the relationship you're in, Valentines day can be tricky. My advice: never buy a girl underwear, no matter how far into a relationship you are. It almost always never ends well. With that said -- here you go!