Published: 01:31 BST, 10 February 2015 | Updated: 12:57 BST, 10 February 2015
She caught the attention of audiences the world over with her bizarre performance at the 57th annual Grammy Awards on Sunday.
With her back pointedly turned to the crowd, Australian singer songwriter Sia Furler's pitch-perfect tones reverberated through the amphitheater while two dancers, including actress Kristen Wiig, dressed in nude bodysuits and matching platinum wigs, writhed around the stage in her stead.
But with 25 million record sales and a string of accolades to her name, why does the woman behind the wig refuse to show her face?
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Who is the real Sia: She's sold over 25 million songs and was nominated for four Grammy Awards in 2015 but why does Sia Furler feel the need to hide her face?
'It's horrible, I just wanted to have a private life,' the intensely camera-shy 39-year-old told the New York Times last year of her meteoric rise to fame.
'Once, as my friend was telling me they had cancer, someone came up and asked, in the middle of the conversation, if they could take a photograph with me.'
Struggling to project an extroverted persona whilst on stage, the fame-shunning singer's unwillingness to be in the spotlight has escalated to the point where she hides her face behind masks, heavy paint and, most recently, a blonde bobbed wig.
Sia refused to appear in the cover art or the music video of her latest single Chandelier and featured on the cover of Billboard Magazine with a paper bag over her head in October 2013.
Writing over the front of the bag read: 'This artist is responsible for over 12 million track sales, has a new single on the Hunger Games soundtrack and doesn't want to be famous...'
Bizarre: The Australian singer-songwriter had her back to the audience while singing her hit Chandelier at the Grammys on Sunday night, she let Kristen Wiig (left) and 12-year-old Maddie Ziegler (right) dominate the stage in her stead
Attention detracting: The fame-shunning 39-year-old, pictured here after her Grammys performance, rarely shows her face unobscured while on stage
More recently, Sia raised eyebrows when she took to the stage on the Ellen DeGeneres show inside of a giant white box, earlier this month.
Only her head could be seen poking out of the top but a blonde wig with long bangs completely covered her eyes and nose.
In similar performances on US talks shows Late Show With Seth Meyers and Jimmy Kimmel Live, she was seen spooning Girls creator and star Lena Dunham - who also donned a platinum wig - while lying face down on a bed and singing covered in face paint, with her back to the audience respectively.
Sia also obscured her features in behind-the-scenes footage released of the filming of her controversial music video for Elastic Heart.
The blonde was seen sitting in a director's chair while she explained her creative choices but a large bunch of bananas was superimposed to cover her face.
Hiding: The intensely camera-shy performer hates the fame her stellar singing career has generated, saying it has made her want to be invisible
Bizarre: The Clap Your Hands hitmaker performed inside of a large white box and with a wig over her eyes and nose on the Ellen DeGeneres show earlier this month
In the past the Clap Your Hands singer has lamented her growing profile, and in 2010 told the Sydney Morning Herald that her celebrity status has changed her, so she often doesn't go out in fear of being recognised.
'I don't really even go out that much now except to walk my dogs, because I don't want to be recognised,' she said.
'I used to be a really friendly person and now I just want to be invisible. I liked myself much more before I got famous. I was much friendlier and had more energy,' she added.
The songstress' shy personality and fear of fame almost led her to be smothered by her own success, and in 2010 she seriously contemplated taking her own life while battling addictions to alcohol and drugs and struggling with depression.
She went so far as to leave instructions and pen a suicide note as she considered taking a concoction of narcotics.
Uncomfortable in the spotlight, the singer relied on alcohol to get her through live shows whilst on her US tour and later became addicted to antidepressants and pain medication including Xanax and OxyContin, after being diagnosed with bipolar disorder.
Strange bed fellows: The wig has now become synonmous with Sia, who is seen here laying face down in a bed while spooning Girls creator Lena Dunham, who was also wearing a wig, on the Late Show With Seth Meyers
In the background: The Adelaide-born star, pictured wearing a visor over her eyes on Saturday Night Live last month, says she wants to focus more on creating visual art to accompany her singing and songwriting
Sadly, her battle with alcoholism and depression intensified after her boyfriend was hit by a taxi driver and killed just days before she was due to visit him in London.
Two months before her September suicide attempt, Sia phoned her drug dealer and 'ordered "two of everything", except meth and heroin'.
Planning to check into a cheap hotel, she left instructions for her dog walker and the hotel manager, writing: 'I've killed myself and I don't want you to have to suffer seeing my dead body'.
A timely call from a friend prompted a re-evaluation and Sia decided to enroll in a 12-step recovery program and take a break from her solo career.
Sia only returned to the spotlight in 2014 after working exclusively as a songwriter and released her sixth studio album 1000 Forms Of Fear, to much critical acclaim in July.
Her first solo project since 2010, the debut single Chandelier, rocketed to the top of the US charts and has been performed by the singer on a host of talk shows and awards ceremonies including most recently, at the Grammys.
The music video, that features Dance Moms star Maddie Ziegler, has garnered an incredible 500 million views on Vevo and won her a string of nominations at the MTV VMAs, EMAs, ARIAs and Grammys.
Presssured: She says the pressure of being in the spotlight almost drove her to take her own life in 2010, pictured here with her covered her face in heavy paint on Jimmy Kimmel Live
Gone bananas! Sia superimposed a bunch of bananas over her face in behind-the-scenes footage from the making of her Elastic Heart video
Her recently released follow up hit Elastic Heart, has caused just as much of a stir, with the music video again featuring Maddie who teams up with a shirtless Shia LaBeouf, 28, to wrestle in a cage.
She was forced to address the backlash over pedophilia concerns and said on Twitter in January:
'I anticipated some 'pedophelia!!!' Cries for this video. All I can say is Maddie and Shia are two of the only actors I felt could play these two warring 'Sia' self states.
'I apologize to those who feel triggered by Elastic Heart, my intention was to create some emotional content, not to upset anybody.'
Following it's release on January 7, the controversial clip has attracted in excess of 100 million views on YouTube.
Born to parents Phil Colson and Loene Furler from rockabilly band The Soda Jerx, creativity is in Sia's blood and she now says she hopes to focus her attention on creating visual art - such as her music videos and striking live performances - to accompany her already renowned singing and songwriting.
'She doesn't want to be famous':She appeared on the cover of Billboard magazine in 2013 with a brown paper bag over her head, and says she often doesn't go out for fear of being recognised
Reluctant star: The naturally shy songstress has always been uncomfortable with fame and has taken to wearing masks and heavy paint to obscure her face on stage
The performer, who now has a reported net worth of AUD million, first rose to notoriety as a songwriter, penning hits including Rhianna's Diamonds, Beyonce's Pretty Hurts, Britney Spears' Perfume and Flo Rida's Wild Ones.
She also co-wrote and featured on David Guetta's mammoth hit Titanium, which she says was released without her knowledge.
The hitmaker had recorded her own version of the song intended only as a guide for the female vocalist chosen for the part, but producers liked it so much they released it to the public in a move Sia now confesses was great for her career.
Much prior to that, the Australian made a cameo appearance as a wedding singer on popular soap Home And Away.
At the time, the ARIA winner was just 22 and only had her debut album Only See, under her belt.
Waring self: Sia's music video for Elastic Heart starring Maddie Ziegler, 12, and Shia LaBeouf, 28, sparked backlash over pedophilia concerns but the singer claims they represented two warring self states
The hitmaker, who garnered over 500 million views for her Chandelier music video, made a cameo appearance as a wedding singer on Home And Away when she was just 22
She was featured standing on the sand at the iconic Palm Beach, and sang her single How To Breathe, which she had written for the show.
More recently, Sia has collaborated with fellow Australian Kylie Minogue on her new album Kiss Me Once with Kylie pinning the sexually charged nature of many of her songs on the blonde star.
Sia reportedly wed American documentary maker Erik Anders Lang in a secret ceremony in August last year after her mother Loene Furler confirmed their engagement in June.
The couple attended Clive Davis' Pre-Grammy Gala together on Saturday night, but Sia chose a different partner to walk the red carpet with at the actual awards ceremony the following day.
Accompanied by 12-year-old Maddie, the She Wolf hitmaker was up to her old tricks and covered her face in an oversized wig with a heavy fringe, the blonde bob now synonymous with the singer.
Drawn on markings were scrawled across her hands and forearms, adding to the bizarreness of the look.
Settled down: Sia is said to have wed American documentary maker Erik Anders Lang in a secret ceremony in August last year after her mother Loene Furler confirmed their engagement in June
The couple made an appearance at the Pre-Grammy Gala in Beverley Hills on Saturday night and were pictured with (L-R) Martin Bandier, Pharrell Williams, Nile Rodgers