Kai Chase says the singer hired a private circus for his daughter's 11th birthday party in 2009 in the backyard of his rented mansion.
Chase says the performance was a Cirque du Soleil style performance with men on stilts and a woman performing in a giant balloon. The celebrity chef continues to work for the singer's children and his mother.
She says Paris Jackson, now 15 years old, has not had a birthday party since then.
Chase is testifying in Katherine Jackson's lawsuit against AEG Live LLC over her son's death.
AEG Live denies any wrongdoing.