Cara Delevingne’s sister Poppy ‘rushes to her side’ following a series of erratic public appearances

Cara Delevingne’s sister has raced to be by the side of the troubled supermodel amid growing concern over her erratic behaviour.

Poppy, 36, who lives in London, was spotted leaving Cara’s Los Angeles mansion on Friday night.

Just days ago, troubling images emerged of Cara, 30, behaving erratically. 

She left her feet dangling from the window of a Chevy Suburban as a driver took her to the private Van Nuys airport in LA to board a Gulfstream V private jet.

Wearing a Britney Spears T-shirt, she made her way to the plane but disembarked 45 minutes later and was spotted pacing up and down, bending over and ‘acting jittery’, according to onlookers. 

‘She was chain-smoking and speaking heatedly into her cellphone, which she dropped on the tarmac at one point,’ a witness told The Mail on Sunday.

Earlier this month, Cara was spotted outside an LA sex shop smoking an unknown substance from a pipe and dropping liquid from a bottle into her mouth.

A family friend said: ‘It is all very troubling. Cara has been open about her mental health issues in the past. 

‘She comes from a very good, close family and, of course, they will rally round and do whatever it takes to help her. 

Worried family: Just days ago, on September 5, troubling images emerged of Cara, 30, behaving erratically

‘The family is clearly worried about her, which is why Poppy immediately went to be with her. Everyone is concerned about Cara’s behaviour.’

The model and actress was expected to attend a Puma catwalk show in New York on Tuesday but sources now say she is ‘unlikely’ to attend. 

In April her bankers, HSBC, registered a charge against her company Cara & Co, despite the fact that it has assets of £41.4 million. 

It has been speculated that the action was taken to protect the interests of her bankers in case her firm suffers a sudden reversal of fortune.