Celebrity Metallica's Lars Ulrich Celebrates His Bachelor Party The star gathered a group of guys – including Bradley Cooper – for a weekend in San Francisco By Melody Chiu Melody Chiu Instagram Twitter Melody Chiu is a Senior Editor for PEOPLE. She has been with the brand since 2009, editing, writing and reporting across all entertainment verticals. She oversees PEOPLE's music and events coverage and has written cover stories on Taylor Swift, Selena Gomez, Melissa McCarthy, Blake Shelton and Sandra Oh. The Los Angeles native graduated from the University of Southern California and has appeared on Extra!, The Talk, Access Hollywood and Good Morning America. People Editorial Guidelines Published on March 2, 2015 07:55 PM Share Tweet Pin Email Photo: Jason Merritt/WireImage This rock ‘n’ roller is getting hitched! Drummer Lars Ulrich, one of the founding members of Metallica, celebrated his upcoming nuptials to model Jessica Miller with a boys’ weekend in San Francisco. On Saturday, the musician hit up Lucky Strike for a night of bowling in a private room with Bradley Cooper, Ian McKellan and James Hetfield, the lead singer of Metallica. “Bradley was the top bowler,” says a source. “They hung out in the private Green Room and ate sushi and spinach dip.” Though it was Ulrich’s bash, the star took the time to sign a bowling pin for the staff before heading off to a celebratory dinner. Ulrich, 51, and Miller, 31, got engaged in 2013. This will be the third marriage for the drummer, who has four sons and was previously married to Debbie Jones and Skylar Satenstein.