The 'Chain Reaction' hitmaker - a close friend to the late Michael Jackson, who was named a back-up guardian to his three children in the singer's 2002 will - is said to be ''extremely concerned'' about her godchild's well-being following the incident last week, and has offered her support to Paris' grandmother, Katherine Jackson.
A source told RadarOnline.com: ''Diana is extremely concerned about Paris. She was stunned that Paris attempted suicide and has vowed to make sure she gets the help she needs.''
According to Michael's final will before his death, Diana, 69, would gain custody of daughter Paris, 15, and brothers Prince, 16, and Blanket, 11, should their 83-year-old grandmother no longer be able to take care of them.
However, although she is worried about Paris, the former Supremes singer isn't said to be interested in taking custody of the children away from Katherine as she feels they are well looked after in her care.
The source added: ''Diana absolutely isn't going to make a move for custody of the children.
''She only wants what is best for them. Diana has tremendous respect for Katherine and all that she has done for the children and told her, last week when they spoke, that if she needed anything, she stands ready to help in anyway.''
Diana has been keeping a watchful eye over Michael's children following their father's death from acute Propofol intoxication in June 2009.