She was once a X Factor contestant who - rather bizarrely - performed barefoot.
But, after wowing fans in a stunning floor-length gown at the Mastercard Olivier Awards on Sunday, Diana Vickers has proved that she's all grown up and a serious star.
At least that was the image she portrayed when she flirted with gothic vibes at the annual ceremony, which celebrates the UK's very best theatre.
Looking good: Diana Vickers pictured at The Olivier Awards 2014 in central London
The chart-topper sported a sleeveless gown with exposed panels on its decolletage, then accessorised with a simple gold clutch and strappy shoes.
Her blonde hair was worn in a simple centre-parting, while here eyes were heavily defined in black make-up.
Naturally, Diana was at the awards to represent her West End play The Duck House, in which she appears alongside Ben Miller.
Classy: Diana walked a fine line between classy and sexy - but managed to keep it appropriate
From X factor to x-quisite factor! Diana Vickers seems to have grown up into a glam young woman
In the production, which tells the story of a fictional MP, Robert Houston who becomes embroiled in an expenses scandal as he switches from one party to another, Diana plays Holly, the girlfriend of Houston's son.
But the story is set in 2009, when the MPs expense scandal truly blew up during Gordon Brown's term as Prime Minister and a year before the General Election.
Miller plays the Labour backbencher, who in a bid to save his place in Parliament, decides to cross the floor to the right, but on the eve of his switch, the expense story hits, and soon Robert and his team are forced to spin their way out of trouble.
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But, despite winning strong reviews, it was not the toast of the evening. Irreverent musical The Book of Mormon and hit geopolitical drama Chimerica were the big winners.
The Book of Mormon - which stormed London just as it earlier wowed New York - won four prizes, including best new musical and best actor in a musical, for Gavin Creel.
The awards, Britain's equivalent of Broadway's Tonys, honor achievements in London theater, musicals, dance and opera.
Founded in 1976, the Oliviers have been laying on the glitz in recent years, with glossy ceremonies modeled on the Tonys.
Floor filler: Diana Vickers wowed fans when she arrived on the red carpet on Sunday night
This year's hosts were actors Gemma Arterton and Stephen Mangan, and performers included tenor Joseph Calleja, Broadway legend Bernadette Peters and ABBA's Benny Andersson and Bjorn Ulvaeus, who reunited onstage to celebrate the 15-year West End run of 'Mamma Mia.'
Winners in most categories were chosen by a panel of stage professionals and theatergoers. The
Audience Award, decided by public vote, went to Les Miserables.
Screen stars Jude Law, Tom Hiddleston and Judi Dench were among the big-name nominees who missed out on acting prizes - Dench to Manville and the men to Rory Kinnear, one of Britain's leading stage actors, awarded for his scheming Iago in Othello at the National Theatre.
2014 OLIVIER AWARDS: FULL LIST OF WINNERS
Best Actor - Rory Kinnear for Othello at the National Theatre
Best Actress - Lesley Manville for Ghosts at the Almeida Theatre and Trafalgar Studios
Best Actor in a Supporting Role - Jack Lowden for Ghosts at the Almeida Theatre and Trafalgar Studios
Best Actress in a Supporting Role - Sharon D Clarke for The Amen Corner at the National Theatre
American Airlines Best New Play - Chimerica at the Almeida Theatre and Harold Pinter Theatre
Best New Comedy - Jeeves and Wooster In Perfect Nonsense at the Duke of York's Theatre
Best Director - Lyndsey Turner for Chimerica at the Almeida Theatre and Harold Pinter Theatre
Best Actor in a Musical - Gavin Creel for The Book Of Mormon at the Prince of Wales Theatre
Best Actress in a Musical - Zrinka Cvitesic for Once at the Phoenix Theatre
Best Performance in a Supporting Role in a Musical - Stephen Ashfield for The Book Of Mormon at the Prince of Wales Theatre
MasterCard Best New Musical - The Book Of Mor! mon at the Prince of Wales Theatre
Best Revival - Ghosts at the Almeida Theatre and Trafalgar Studios
Best Musical Revival - Merrily We Roll Along at the Harold Pinter Theatre
Best Theatre Choreographer - Casey Nicholaw for The Book Of Mormon at the Prince of Wales Theatre
Best Entertainment and Family - The Wind In The Willows at the Duchess Theatre
Autograph Sound Award for Outstanding Achievement in Music - Once - Martin Lowe for composition and arrangements, Glen Hansard and Marketa Irglova for music and lyrics
White Light Award for Best Lighting Design - Tim Lutkin and Finn Ross for Chimerica at the Almeida Theatre and Harold Pinter Theatre and Paul Pyant and Jon Driscoll for Charlie And The Chocolate Factory at Theatre Royal Drury Lane
Best Sound Design - Carolyn Downing for Chimer! ica at the Almeida Theatre and Harold Pinter Theatre and Gareth Owen for Merrily We Roll Along at the Harold Pinter Theatre
Best Costume Design - Mark Thompson for Charlie And The Chocolate Factory at the Theatre Royal Drury Lane
XL Video Award for Best Set Design - Es Devlin for Chimerica at the Almeida Theatre and Harold Pinter Theatre
Outstanding Achievement in an Affiliate Theatre - Handbagged at the Tricycle Theatre
Best New Dance Production - Eastman - Sidi Larbi Cherkaoui & Sadler's Wells for Puz/zle at Sadler's Wells
Outstanding Achievement in Dance - Michael Hulls for his body of lighting work including Ballet Boyz - The Talent at Sadler's Wells
Best New Opera Production - Les Vepres Siciliennes at the Royal Opera House
! Outstanding Achievement in Opera - English Touring Opera for its brave and challenging touring productions at the Linbury Studio Theatre, Royal Opera House
BBC Radio 2 Audience Award - Les Miserables at the Queen's Theatre
Special Award - impresario Michael White
Special Award - The National Theatre's Sir Nicholas Hytner and Nick Starr
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