A change is as good as a holiday, isn't that right Jennifer Aniston? She of the immaculate tan showed two very different sides of her sartorial personality on the red carpet, working two diverse looks for her Horrible Bosses press tour. Initially we saw a sleek and super sexy Jen step out for photocall duties in London yesterday, opting for a minimal black leather Céline shift which she teamed with Gucci ankle strap stilettos. Jennifer then switched things up with a demure, high necked dress from Valentino's couture A/W '11 collection and Tom Ford ankle wrap heels for the film's UK premiere. So, we gotta ask... which style do you prefer on Jen; sexy or sweet?