Metallica's Lars Ulrich Celebrates His Bachelor Party
03/02/2015 AT 07:55 PM EST
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.