Holy hair wars: Not one but two major celebs just debuted new ‘dos—and both of them are well known for their trendsetting coifs. Yesterday, Justin Bieber (or “The Biebs” as so many of his pre-teen fans affectionately call him) revealed a shorter style while on the set of TMZ. So far there are a lot of mixed feelings: OK Magazine reports that many of his fans are unfollowing him on Twitter because of the cut and that the hashtag #riphairflip has been a trending topic since he revealed the look. Wowza. Let’s hope that Jennifer Aniston gets a warmer reception with her new bob, which she debuted earlier today at a photocall in Spain for her movie Just Go With It. Personally, I love, love, LOVE Jen’s new style (I am a huge fan of hers and as far as I am concerned, she can do no wrong), but I don’t mind Bieber’s more “mature” cut—he needed to shake things up. What do you think? Vote in our poll for your favorite!