Back together after a nearly nine year hiatus, the cast of “American Reunion” gathered for the Hollywood, CA premiere of the new Universal Pictures film on Monday night (March 19).

Drawing out quite the impressive crowd, the stars were out in full force for the second day of the annual Coachella Music and Arts Festival in Indio, California on Saturday (April 17).

Joining in of the fun-filled festivities were beauties such as Hayden Panettiere, Katy Perry, Paris and Nicky Hilton, Whitney Port, Mischa Barton, Camilla Belle, Rosie Huntington-Whiteley, Beyonce Knowles, Alessandra Ambrosio, Kristin Cavallari, Kate Bosworth, Lauren Bosworth, Peaches Gedolf, Dita Von Teese, Bridget Marquardt, Shannon Elizabeth and Kelly Osbourne.

While the major festivities don’t get underway until this Sunday evening, the 2008 MTV Movie Awards pre-parties have already started out in Los Angeles, California.

On Thursday afternoon, stars including Christina Milian and Shannon Elizabeth were among those in attendance at the always-popular Kari Feinstein MTV Movie Awards Style Lounge.