Katy Perry & James Van Der Beek Celebrate Their 'Chic' Pal
05/23/2012 AT 06:00 AM EDT
At the bash, hosted by the venue's owner John Terzian, Perry "was in such an amazing mood," an onlooker tells PEOPLE. "She liked a drink called the JoJo, and was really happy to be with her friends."
At one point, Van Der Beek – who was there with wife Kimberly – and Perry made a toast to their mutual friend and "told him how chic he is," the source says.
Chord Overstreet was also present during the celebration.
– Dahvi Shira