Ploom joined LA's ALT 98.7 December 9th on the Hollywood W Hotel rooftop for the ultimate ALTimate Xmas party. A panoramic view of the city provided the perfect backdrop for performances by MS MR, ALT-J, Airborne Toxic Event, The National, Silversun Pickups and AWOLNATION - and a surprise set by Imagine Dragons! Rock legend Joan Jett; Superman himself, Henry Cavill; Will and Grace's Eric McCormack and Audrina Patridge joined the iconic 98.7 radio station to celebrate the season, while thrilled Angelenos rocked out, Plooms in hand. Thanks to ALT 98.7 for hosting! Make sure to click through for more party pics.