TIME magazine's 100 issue is out, and there's a host of celebrities in the mix. Oprah Winfrey is on the list for the eighth time (that's every year the TIME 100 has existed, for those keeping track), as well as young guns like Justin Bieber, 'Glee' star Chris Colfer, Bruno Mars, and 'Parks and Recreation' star and producer Amy Poehler.

One great tradition of the TIME 100 is stars writing testimonies about their peers. Dianna Agron writes of Colfer, "Chris, 20, lives by extreme truth, speaking out against the epidemic of bullying that he, too, faced in high school. The honesty that he in­fuses into his Glee character, Kurt, leaves you reeling." Read more and see video interviews here.