Congratulations, everyone. You survived your first full work week of 2015, and you did so in style. Trust us, the next one will be way easier — but in case you're still feelin' that post-holiday fatigue, ease back into Monday with a look at the most out-of-this-world celeb news of the week. Think Taylor Swift's armpits and the new way to flaunt your backside. You'll understand shortly...