Demi Lovato rocks AC/DC top in West Hollywood... after revealing she used to be 'a nightmare to work with' before sobriety

Demi Lovato was all smiles while rocking a grey AC/DC T-shirt while strolling through West Hollywood on Wednesday.

Who knew the 23-year-old pop star was such a big fan of the Australian rock band, who enlisted Guns N' Roses frontman Axl Rose for their current Rock or Bust World Tour.

The GLAAD Vanguard Award winner paired her top with an Army green jacket and dark rinse flared jeans as she toted a Chanel purse.

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Out and about: Demi Lovato was all smiles while rocking a grey AC/DC T-shirt while strolling through West Hollywood on Wednesday

Out and about: Demi Lovato was all smiles while rocking a grey AC/DC T-shirt while strolling through West Hollywood on Wednesday

Thunderstruck! Who knew the 23-year-old pop star was such a big fan of the Australian rock band, who enlisted Guns N' Roses frontman Axl Rose for their current Rock or Bust World Tour

Thunderstruck! Who knew the 23-year-old pop star was such a big fan of the Australian rock band, who enlisted Guns N' Roses frontman Axl Rose for their current Rock or Bust World Tour

Dressed down: The GLAAD Vanguard Award winner paired her top with an Army green jacket and dark rinse flared jeans as she toted a Chanel purse
Dressed down: The GLAAD Vanguard Award winner paired her top with an Army green jacket and dark rinse flared jeans as she toted a Chanel purse
Dressed down: The GLAAD Vanguard Award winner paired her top with an Army green jacket and dark rinse flared jeans as she toted a Chanel purse

Dressed down: The GLAAD Vanguard Award winner paired her top with an Army green jacket and dark rinse flared jeans as she toted a Chanel purse

This week, Demi admitted that prior to her two rehab stints and four years of sobriety, she was 'a nightmare to work with.'

'Just b****y, a c***,' the former Disney Channel star revealed to Refinery29.

'I was one of those people who was like, "I don't give a f***, whatever." And I used that as an excuse to do whatever I wanted.'

The Stone Cold songstress has transformed into a homebody after leaning 'the hard way that I can't do parties anymore.'  

'Just b****y, a c***!' This week, Demi admitted that prior to her two rehab stints and four years of sobriety, she was 'a nightmare to work with' (pictured in 2010)
'Just b****y, a c***!' This week, Demi admitted that prior to her two rehab stints and four years of sobriety, she was 'a nightmare to work with' (pictured in 2010)

'Just b****y, a c***!' This week, Demi admitted that prior to her two rehab stints and four years of sobriety, she was 'a nightmare to work with' (pictured in 2010)

The former Disney Channel star revealed to Refinery29: 'I was one of those people who was like, "I don't give a f***, whatever." And I used that as an excuse to do whatever I wanted'

The former Disney Channel star revealed to Refinery29: 'I was one of those people who was like, "I don't give a f***, whatever." And I used that as an excuse to do whatever I wanted'

Same jacket! As for an engagement with her live-in, on/off boyfriend since 2010 Wilmer Valderrama, Demi said, 'It's nobody's business but ours, and when it happens, it happens' (pictured April 17)

Same jacket! As for an engagement with her live-in, on/off boyfriend since 2010 Wilmer Valderrama, Demi said, 'It's nobody's business but ours, and when it happens, it happens' (pictured April 17)

'Some people can go out and not be triggered, but that’s not the case for me,' Lovato shrugged.

'I know [my life] sounds so boring, but I've come to a place where I'd rather be relaxed than get all dressed up and go to some party or club with people who don't really care about my well-being at all.'

As for an engagement with her live-in, on/off boyfriend since 2010 Wilmer Valderrama, Demi said: 'It's nobody's business but ours, and when it happens, it happens.'

The Hillary Clinton supporter - who's been battling bronchitis - will next use her four-octave pipes at this Sunday's Billboard Music Awards.  

Airing on ABC! The Stone Cold songstress - who's been battling bronchitis - will next use her four-octave pipes at this Sunday's Billboard Music Awards (pictured Saturday)

Airing on ABC! The Stone Cold songstress - who's been battling bronchitis - will next use her four-octave pipes at this Sunday's Billboard Music Awards (pictured Saturday)

Lovato will then co-headline the 42-show Future Now: The Tour with Nick Jonas beginning June 29 at Georgia's Philips Arena in Atlanta.

'By the time I go on tour, I want to be able to perform new songs,' the Sketchers spokesmodel - who boasts 114M followers - teased.

'Ideally, I would release a single next month.'

Reunited: Lovato will then co-headline the 42-show Future Now: The Tour with Nick Jonas beginning June 29 at Georgia's Philips Arena in Atlanta

Reunited: Lovato will then co-headline the 42-show Future Now: The Tour with Nick Jonas beginning June 29 at Georgia's Philips Arena in Atlanta

The Hillary Clinton supporter - who boasts 114M followers - teased: 'By the time I go on tour, I want to be able to perform new songs. Ideally, I would release a single next month'

The Hillary Clinton supporter - who boasts 114M followers - teased: 'By the time I go on tour, I want to be able to perform new songs. Ideally, I would release a single next month'

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