You sound rushed! I know, I'm one to talk, already applying to Comp Lit PhD programs straight out of undergrad, but there is no rush. Take up a language now, whether German or another language your college offers (French is pretty useful in literary fields, although not really any easier than German, AFAIK). Comp Lit programs want at least two foreign languages, at various degrees of proficiency, going in, yes, so you have to do that now. Then take a year or two off after college, and take Russian classes at a community college or cultural center, or whatever you might have access to.
I want to stress the importance of starting as early as possible to learn a new language. I would also advise you to do your best to show you pick up languages easily, and in general learn quickly. In top PhD programs, you are required to demonstrate fluent reading ability in two foreign languages, plus basic reading knowledge in a third, after two years of coursework. If you apply with English, 5-7 semesters of German (assuming you take some time off after college), and a year or two of Russian, the adcom needs to believe you'll be able to better your two foreign languages and pick up a third while in the program.
But even more importantly in your case, I suggest you build strength in a particular area of literary studies, like theory, to be able to compete. To gain admission into a Comp Lit program, you'll be in competition with people who speak 4 or 5 languages and know a handful more. You need to have something distinctive the adcoms will want.
I don't mean to sound discouraging! I've heard of plenty of people who picked up foreign languages, difficult ones, in college or even later and achieved fluency quickly. You can do it; just start as soon as possible!
PS: If you can take up Latin, I always recommend it. It's not particularly easy, but it counts as a foreign language, and is especially useful since it fulfills the requirement some schools have for a classical or cross-cultural language.