One of Struggle Street's most controversial residents is behind bars after being caught driving while disqualified by police in Mount Druitt.

Young mother Billie Jo Wilkie, was widely condemned for her blatant drug use while pregnant after the 22-year-old was shown smoking a bong on a toilet with her mother in second installment of the SBS TV documentary on Wednesday night.

Wilkie was charged and refused bail after being local police discovered her driving while disqualified in an unregistered vehicle on Thursday afternoon.

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Young mother Billie Jo Wilkie (pictured) is behind bars after being caught driving while disqualified in an unregistered vehicle by Mount Druitt police

Wilkie was shown in the final Struggle Street episodes sitting on a toilet while she was pregnant and smoking drugs with her mother

Six hours after the initial incident, she was pulled over while driving again for a random breath test, and was subsequently held overnight without bail, The ABC reported.

The 22-year-old faced Mt Druitt Local Court on Friday and will appear before the court again on Monday.

Wilkie was slammed on social media after SBS aired the final two episodes of the program run back-to-back on Wednesday night.

'If you decide to become pregnant and take drugs, you're disgusting. I don't care about addictions or "circumstances",' Twitter user Fear Blandness wrote.

Ms Wilkie has a family history of neglect, death, abandonment and physical and mental disease.

The program explained that the mother of three was born a methadone addict and was pregnant when SBS began filming the documentary last year.

Ms Wilkie's mum Carlene is shown lighting a bong on their bed and coughing.

'I feel like I'm overdosing on marijuana. That's my granddaughter in there and her name's Carlene, so I say,' she laughs, while patting Ms Wilkie's stomach.

'You could call her Crystal cause of crystal meth,' Ms Wilkie joked.

'I was pulling a bong that's my business do you know what I mean? So it shouldn't have been broadcast,' Wilkie said in a television interview last week

Billie Jo Wilkie, a mother of three from Mount Druitt, in Sydney's western suburbs, was born a methadone addict and was pregnant when SBS began filming their documentary series Struggle Street last year

Carlene's plan to limit her daughter's drug use while pregnant is to only let her smoke marijuana, as Ms Wilkie has already had two children taken into care.

'Billi is such a good mum I think this is the thing that's going to really pull her up,' Carlene says.

In one scene, Ms Wilkie goes into labour and demands a cigarette to ease the pain rather than go to hospital.

'Seeing a pregnant woman smoking drugs and cigarettes makes me sick. I'm not interested in excuses. Harming an unborn child??, ' Tenar Larsen wrote on Twitter.

Another viewer, Tom Malone asked: 'What responsibilities does production crew have when pregnant lady is smoking bongs and ciggies and clearly harming bub?'

Wilkie's relationship with Bob Quinn is also a main thread of the documentary, as they both struggle with drug addictions and keeping their relationship intact.

In the first episode, they were shown trying to break into a housemate's room with a crowbar to find a piece for their bong so they can get high.

A storm erupted in the media leading up to the airing of the first episode of Struggle Street over whether the network was cashing in on the struggles of the people in the series.

SBS denied it had engaged in 'poverty porn' and defended itself against claims by one family in the program that they had been portrayed as 'bogans.'

The program follows a group of people living in Mount Druitt, in Sydney's western suburbs, most of whom are jobless, welfare dependent and living tough lives.

The program aimed to contrast their existence with the wealth-and-glamour image of Sydney, Australia's 'Emerald City.'

Anyone who is suffering from depression or mental health issues should contact Lifeline on 131 114 (Australia) the National Suicide Prevention Lifeline on 1800 273 8255 (USA) or the Samaritans on 08457 90 90 90 (UK), or a local help group.

'Seeing a pregnant woman smoking drugs and cigarettes makes me sick. I'm not interested in excuses. Harming an unborn child??, ' Tenar Larsen wrote on Twitter

Wilkie's struggle with drug use are shown throughout the three-part series, including a scene where she goes into labour and smokes a cigarette to ease the pain