While most of us were hard at work and looking forward to the weekend on Thursday, Kellie Pickler was in the rain forest ... in a bikini. "Island sun & rum...nothing but fun!" the 'Tough' hitmaker tweeted a few days ago, as she soaked up a little bit of warm weather on her post-Christmas vacation. Pickler rubbed it in when she posted a photo of herself wrapped in a towel in front of a waterfall, but she'd better hurry home -- 2012 is almost here, which means her new '100 Proof' album will be here soon, too!