Kelly O & Amy's Dad Celebrate Winehouse's Life

7/29/2011 6:30 AM PDT

Kelly O & Amy's Dad -- Together for Winehouse

Kelly Osbourne and Amy Winehouse's father Mitch gathered at a London club on Thursday to commemorate the late singer's life. Also in attendance were Mark Ronson and Amy's boyfriend Reg Traviss.

The cause of Amy's death has yet to be determined.