ellen pomeo shonda rhimesCelebrities often help each other out.Frederick M. Brown/Getty Images

From an outsider’s perspective, Hollywood seems like a close-knit friend group, a lunch table full of A-list stars who all know one another and hit the same parties. Although that, of course, isn’t the case, it is true that a number of stars rub shoulders with each other at industry events — and many even go out of their way to help one another’s careers. From co-workers to mentors to friends, we rounded up a number of celebrities who have made a positive impact on other celebrities’ careers.