New England Patriots tight end Rob Gronkowski is absolutely using his time wisely during this soon-to-be-ending NFL Lockout®. Dude seems to have been working out and staying sane by constantly tweeting with buxom 19-year-old SI bombshell Kate Upton. Maybe you've heard of her? Anyway, Gronk was up to his old ways yesterday with this masterpiece that caught Kate's attention. More of the Tweet romance - JUMP!