Paris Jackson's family are reportedly worried she's heading for a ''serious meltdown.''

The 20-year-old actress - the daughter of the late Michael Jackson - shocked her fans last month when she uploaded a video onto social media of her walking along a skyscraper ledge in the dark and now her relatives are concerned about her antics.

A source told the New York Post newspaper's Page Six column that her risky clip - which she captioned ''I almost died'' was even more heart-stopping than when her father dangled her brother Blanket, now 16, over a hotel balcony in Berlin as a baby.

The insider explained: ''But this is worse than that because I still think Michael had control of Blanket and they weren't nearly as high up as Paris is in this video. She's lost it. She really has. Everyone saw that video, and even though we all knew that she's now OK, watching it was so traumatic.''

And, although her grandmother Katherine - the mother of Michael - is concerned about her free-spirited behaviour, there are no plans to stage an intervention just yet.

The source said: ''It's not happening, but everyone will regret it if she dies out there.''

Although her family aren't impressed by her recent antics, one thing they have approved of is her relationship with British model Cara Delevingne, 25.

The pair have been dating one another since they met at the MTV Movie Awards last year but they only went public with their relationship last month.

An insider said recently: ''This is indeed a loving healthy relationship between Paris and Cara. It is probably the healthiest and happiest relationship Paris has ever been in, and for that, her family has their full support.''