It was a mini-Entourage reunion at the Creative Coalition Teachers Making a Difference lunch in Park City yesterday. Jeremy Piven and Adrian Grenier both brought their mentors out to the celebratory and charitable Sundance event held at the Bing bar. Jeremy chose to honor his mother on stage while Adrian brought along his high school drama instructor Henry Shifman. Jeremy also has a film at the festival, I Melt With You, which premieres later today. He was coming straight from filming So Undercover in New Orleans with Miley Cyrus and he had nothing but glowing words to say about his young costar. Adrian has been hitting up the Sundance hot spots in support of his short film and celebration of independent cinema. Adrian joked about his post-Entourage career during his presentation with Shifman, while fellow HBO-er Cheryl Hines moderated the philanthropic and big-hearted afternoon. Stay tuned for lots more from the event on PopSugar Rush!