Perrie Edwards transforms into sultry supervillainess Poison Ivy as she leads the stars dressing up for Halloween

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They possess some of the most noticeable faces in the world.

But for one weekend only, the biggest stars in Britain were virtually unrecognisable as they slipped into extravagant costumes in honour of Halloween on Monday.

Leading the glamorous brigade of starlets on the weekend of All Hallows' Eve was Perrie Edwards, who unleashed her naughty side with an outfit based on sultry supervillianess, Poison Ivy.

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That girl is poison! In honour of Halloween, Little Mix's Perrie Edwards, 23, unleashed her naughty side with an outfit based on sultry supervillianess, Poison Ivy

Clad in a scarlet wig, the Little Mix singer, 23, painted her peepers with glittering green eye shadow in leaf form, whilst a pair of coloured contact lenses added some oomph to her ensemble. 

Posing from behind, she donned an emerald dress with tiny spaghetti straps whilst she draped herself in a ruby red stole. 

Pouting with her glossy red lips, Perrie posed with her make-up artist, Anna Lingis, who had opted for a sexy skeleton look. 

Two of a kind: Pouting with her glossy red lips, Perrie posed with her make-up artist, Anna Lingis, who had opted for a sexy skeleton look

Three of a kind: Perrie wowed in her sultry ensemble as she joined Leigh-Anne Pinnock and a pal at Steam & Rye nightclub in London

Super scary! One of the girls' friends opted to dress up as X Factor contestant Honey G, whilst Jade Thirlwall covered herself in white paint for the outing 

Also turning to the dark side for their costume inspiration was Jodie Marsh, who looked terrifying with expertly applied make-up that gave her the illusion of having just half a face. 

Ashley James looked equally as sinister, opting for a creepy clown look complete with a corset and striped tights. 

With her golden locks styled in corkscrew curls, and stunning make-up courtesy of SecretSpa, the former Made In Chelsea star ensured all eyes would be on her. 

Half off: Also turning to the dark side for their costume inspiration was Jodie Marsh, who looked terrifying with expertly applied make-up that looked like half a face

Terrifying! The model rocked all black, keeping the attention on her face 

Send in the clowns! Ashley James looked equally as sinister, opting for a creepy clown look complete with a corset and striped tights and make-up by SecretSpa

Colourful! She added a colourful bow tie to complete her ensemble

Going all out: She showed off her home with pumpkin-clad stairs

Caroline Flack went all out with her ensemble, donning a spaceman-inspired helmet and silver suit. 

Celebrating the holidays overseas, the presenter wrote: 'Halloween New York style', and reference the impracticality of her costume as she added: 'Gonna need a straw all night #atomicgirl.'

Another starlet rocking some headwear was Lottie Moss, who sheathed her golden locks in a nun's habit. 

Living in a cosmic world: Caroline Flack went all out with her ensemble, donning a spaceman-inspired helmet and silver suit

'Gonna need a straw': Celebrating the holidays overseas, the presenter wrote: 'Halloween New York style', and reference the impracticality of her costume

Pumpkin competition! Billie Faiers shared a picture of her peppa pig pumpkin as she headed to a party

Throwing it back! Jess Wright shared a snap as she dressed up as catwoman last year

Rocking a floor length black gown splattered with fake blood, she looked uber glamorous as she posed alongside flatmate Emily Blackwell. 

The Made In Chelsea star looked equally as chic for the occasion, donning a blood soaked Superwoman costume. 

Jacqueline Jossa unleashed her inner heroine with a Katniss Everdeen costume from The Hunger Games, showing off her slender curves in a skintight catsuit whilst accessorising with a bow and arrow. 

Nun's the word: Another starlet rocking some headwear was Lottie Moss, who sheathed her golden locks in a nun's habit as she posed with Superwoman aka Emily Blackwell 

More strings to her bow: Jacqueline Jossa unleashed her inner heroine with a Katniss Everdeen costume from The Hunger Games, showing off her slender curves in a skintight catsuit

Fun with fangs: Georgia May Jagger poked fun at her trademark gap toothed appearance by donning vampire fangs. 'Just what I didn't need... more teeth,' she quipped

Dead in love: Millie Mackintosh and Hugo Taylor opted for cute couples' costumes, as they donned complementary Day Of The Dead ensembles

Georgia May Jagger poked fun at her trademark gap toothed appearance by donning vampire fangs. 

'Just what I didn't need... more teeth,' she quipped alongside her selfie. 

Millie Mackintosh and Hugo Taylor opted for cute couples' costumes, as they donned complementary Day Of The Dead ensembles. 

Sharing a snap on Instagram, the starlet wrote: 'You will be the death of me'. 

Hello, pumpkin: Kelly Brook geared up for the holiday with a spot of pumpkin picking, as she headed out to a spooky farm

Gone all out: Little Mix's Jade Thirlwall who shared a snap of the decorations from her Stranger Things inspired Halloween party

Spooky: Jay Rutland and Tamara Ecclestone also went all out for daughter Sophia as they transformed their sprawling mansion into a haunted house for the weekend

Meanwhile, Kelly Brook geared up for the holiday with a spot of pumpkin picking, as she headed out to a spooky farm. 

Also jazzing up their surroundings was Little Mix's Jade Thirlwall who shared a snap of the decorations from her Stranger Things inspired Halloween party. 

Jay Rutland and Tamara Ecclestone also went all out for daughter Sophia as they transformed their sprawling mansion into a haunted house for the weekend. 

Spooky: Made In Chelsea's Lucy Watson donned vampire fangs whilst Sam Thompson decided to forgo a costume on the night

Cute couple: Lucy looked sexy yet scary as she cuddled up to beau James Dunmore