Polish, Czech, Slovak and Spanish. (the Slovak is cheating, as it's kind of a mix of Polish and Czech, though closer to Czech...but I understand nearly everything, and I guess can speak it if I really try)
But, like others here, I would never say I'm fluent at any of them. Plus I studied Japanese for like 12 years, plus a few years of Indonesian...
But my favourite language is English, and it always will be