Kate Bosworth turned the big 3-0 yesterday! After interviewing her back in October, it became apparent why she's so popular in Hollywood circles — she's just so lovely and down to earth. And let's not forget she's got some serious acting chops and is as stylish as they come. To celebrate this milestone birthday of Kate's, we're looking back at fun photos of her sharing a laugh or sweet moment with some of her many celebrity pals. From designers and style setters to actors and actresses, it's obvious that she's one popular lady! Click through to check all the pictures out — and the happiest of birthdays to you, Kate!