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"I surprised her and flew her down there with a couple friends of ours for three days of absolute crazy fun," Blake tells E! Online. "We got to experience everything: we got drunk, we ate too much, we got seasick one day, we got sunburned, I did a couple shots of salt water that I didn't mean to because the waves were hitting me too hard. We did everything you're supposed to do in Mexico ... including, I drank the water and had diarrhea."