Michael Jackson's embattled daughter Paris has refused to celebrate her birthday ever since her father's untimely death in 2009, a court has heard.

The superstar's personal chef Kai Chase made the startling revelation in a Los Angeles court on Tuesday (18Jun13) as she testified in the ongoing wrongful death lawsuit filed by the King of Pop's mother, Katherine, and the singer's three children against concert promoters AEG Live.

Chase opened up about Jackson's life as a doting dad, telling jurors he would always make sure his kids, Prince Michael, Paris and Blanket, were eating healthily and got enough sleep before school sessions.

She went on to describe Paris' last birthday party in April, 2009, when the 11-year-old's father hired a private circus - featuring men on stilts and women performing in a giant balloon - to entertain his children, while the Thriller hitmaker's songs played throughout the bash, at the request of his daughter.

Chase, who is now employed by Katherine Jackson, also recalled how she had helped Paris decorate a room dedicated to her beloved dad, and told the court, "Paris hasn't had any birthdays since. She hasn't wanted to celebrate since."

The shocking testimony comes just 13 days after Paris Jackson, now 15, was hospitalised following an apparent suicide attempt at her Calabasas, California home.

A statement released at the time by her grandmother Katherine's attorney, Sandra Ribera, suggested the teenager was still struggling to come to terms with her dad's passing: "Being a sensitive 15 year old is difficult no matter who you are. It is especially difficult when you lose the person closest to you. Please respect her privacy and the family's privacy."

The wrongful death lawsuit accuses AEG Live bosses of ignoring the tragic superstar's health issues prior to his doomed This Is It comeback concerts.

The fourth anniversary of the King of Pop's death will be marked on 25 June (13).