Entertainment Movies Chris Pratt Sings Back-Up with Jimmy Buffett at 'Jurassic World' Premiere Party – Watch the Clip! The actor joined the singer for "Margaritaville" onstage at the tropical-themed party By Jacqueline Andriakos Jacqueline Andriakos Jacqueline Andriakos is a former staff reporter and writer at PEOPLE. She left PEOPLE in 2015. People Editorial Guidelines Published on June 10, 2015 08:40AM EDT Photo: Kevin Winter/Getty What can’t Chris Pratt do? The 35-year-old actor jumped onstage beside singer-songwriter Jimmy Buffett at the Jurassic World premiere party Tuesday night to help sing back-up alongside Buffett’s touring group, the Coral Reefer Band. At the tropical-themed bash, held at the Ray Dolby Ballroom in Hollywood, Pratt joined in on Buffett’s “Margaritaville,” while also giving shout-outs to his costar Bryce Dallas Howard and his mom. https://instagram.com/p/3vQhNfkeeh/ After wrapping the movie premiere event next door at the Dolby Theatre, Pratt spent hours during the festive evening posing for photos with fans, alongside his wife, Anna Faris. RELATED VIDEO: Are You Ready for Jurassic World? Partygoers enjoyed tropical drinks, Mexican food and took in the scene beneath fake palm trees, while surrounded by dinosaur sculptures, fake dino eggs and tiki-hut bars. Samsung stations brought the mythical theme park to life with virtual reality headset stations and Jurassic Park video games. Jurassic World opens in theaters Friday.