Paris Jackson hasn't celebrated her birthday since her father Michael Jackson died in June 2009 because she is still feeling "devastated and lost".The 15-year-old aspiring actress -who is currently recuperating in hospital following a suicide attempt earlier this month - hasn't thrown a party on her special day since the private circus bash the King of Pop arranged for her in April 2009, just two months before he died.In the ongoing wrongful death lawsuit that the Jackson family have brought against AEG Live in relation to the star's death, Michael's former personal chef, Kai Chase, revealed how the troubled teen hasn't been coping and "breaks down" in tears all the time.Kai told the court: "Paris hasn't had any birthdays since [Michael died]. She hasn't wanted to celebrate since."She later added: "Being daddy's little girl, Paris is devastated. She's devastated and lost. She's trying to find herself and find who she is."It's taking a lot of love and understanding to keep her together. She breaks down, she cries, she talks about him."Kai revealed how Michael's youngest child, son Blanket, 11 - who is home-schooled - wears a T-shirt with a picture of his dad's face emblazoned on it every Friday.She explained: "He never really had a time when it was father- son because he was so, tiny."The chef then went on to explain how Michael's eldest son, Prince, 16 - who is set to be a key witness in the legal battle - is feeling the strain during the trial.She said: "At 16, the weight of the world is on his shoulders."Michael's mother, Katherine Jackson - who is the legal guardian of Prince, Paris and Blanket - is suing the company for $40 billion as she claims the concert promoters failed to properly investigate Dr. Conrad Murray - who is currently serving four years imprisonment for the involuntary manslaughter of Michael, who died from a Propofol overdose - before entrusting Michael to his care.