UK stars including Alice Eve, Niomi Harris and Lily Allen pull out ALL the ...

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With every year that passes, celebrity Halloween costumes grow increasingly more impressive. 

So Britain's biggest stars were naturally keen to pull out all the stops on Thursday as they donned incredible looks for the spookiest holiday, with Naomie Harris, Alice Eve, Harper Beckham and Lily Allen leading the way. 

The A-list beauties, aged 43 and 37, donned sensational replicas of the iconic costumes worn by Alicia Silverstone and Stacey Dash in their roles as Cher and Dionne in 1995 classic Clueless while the superstar offspring, eight, dressed as Billie Eilish, 17, and Adele's transformation into a dazzling Captain Hook.  

Wow! So Britain's biggest stars were naturally keen to pull out all the stops on Thursday as they donned incredible looks for the spookiest holiday, with Naomie Harris, Alice Eve, Harper Beckham and Lily Allen leading the way

Who's who?! The superstar duo donned sensational replicas of the iconic costumes worn by Alicia Silverstone and Stacey Dash in their roles as Cher and Dionne in 1995 classic Clueless

Wow! So Britain's biggest stars were naturally keen to pull out all the stops on Thursday as they donned incredible looks for the spookiest holiday, with Naomie Harris, Alice Eve, Harper Beckham and Lily Allen leading the way

It came as no surprise to see the Beckham brood had gone all out for a night of trick or treating in Los Angeles on Thursday. Nailing her costume for the holiday was the youngest of the children, Harper who transformed into pop superstar Billie. 

Donning yet another Halloween costume was bombshell Demi Rose who donned a Barbie-inspired ensemble comprising of a PVC bodice which showcased every inch of her spectacular figure. 

MIC star Ashley James took to Instagram to reveal a story behind her costume, as she penned: 'Had a ssssuper sssspooky evening. Once an ex-boyfriend gave me an ultimatum between going to a Halloween party and being with him (as he didn't agree with Halloween) and that's why he's now my ex-boyfriend...

'Best night of the year! Thanks to the Ross's for having me. Now I'm seriously thinking of getting long hair extensions so my hair is always like this. Thoughts? (your input is essential)  

Winning! Lily Allen transformed into the thank you, next era Kris Jenner while Harper Beckham was Billie Eilish

Quirky: Nailing her costume for the holiday was the youngest of the children, Harper Seven, eight, who transformed into pop superstar Billie Eilish

Winning! Lily Allen transformed into the thank you, next-era Kris Jenner while Harper Beckham was Billie Eilish

Spot the difference: The youngster mimicked the look from Billie's when the party's over music video in a white jumper and jogging bottoms

Pictured: Billie in the when the party's over music video

Spot the difference: The youngster mimicked the look from Billie's when the party's over music video in a white jumper and jogging bottoms

Across the pond, the US stars went all out for Halloween, with many delighting their fans with a variety of costumes ranging from the frightening to the sexy to the downright heartwarming.

Heidi Klum, who is known for her extravagant Halloween looks, surpassed all expectations with an amazingly elaborate avatar as an experiment gone wrong.

The 46-year-old model spent the whole day having her costume applied in the shopfront of the Amazon Prime store in New York, where fans could come and watch the process.

Oh my! Donning yet another Halloween costume was bombshell Demi Rose who donned a Barbie-inspired ensemble comprising of a PVC bodice which showcased every inch of her spectacular figure

Pretty in PVC! The model looked incredible in the sexy ensemble while also donning a blonde wig over her brunette locks

Oh my! Donning yet another Halloween costume was bombshell Demi Rose who donned a Barbie-inspired ensemble comprising of a PVC bodice which showcased every inch of her spectacular figure

Horrifying: Across the pond, the US stars went all out for Halloween , with many delighting their fans with a variety of costumes ranging from the frightening to the sexy to the downright heartwarming

Horrifying: Across the pond, the US stars went all out for Halloween , with many delighting their fans with a variety of costumes ranging from the frightening to the sexy to the downright heartwarming

Her look, which included an exposed brain in a see-through protective helmet and torn bits of flesh revealing the sinew underneath, was painstakingly put together by a massive team.

Heidi's outfit was in fact part of a couple's costume with her third and current husband Tom Kaulitz, who was dressed as a newly murdered astronaut. 

Andy Cohen, celebrating his first Halloween since becoming a father, dressed as Snoopy to take his eight-month-old son Benjamin trick-or-treating in New York City.

He had dressed his little pride and joy as Snoopy's sidekick Woodstock and could be spotted carrying him down the city streets to collect some candy.

Amazing: The 46-year-old model spent the whole day having her costume applied in the shopfront of the Amazon Prime store in New York, where fans could come and watch the process

Amazing: The 46-year-old model spent the whole day having her costume applied in the shopfront of the Amazon Prime store in New York, where fans could come and watch the process

Behind the scenes: Her look, which included an exposed brain in a see-through protective helmet and torn bits of flesh revealing the sinew underneath, was painstakingly put together by a massive team

Behind the scenes: Her look, which included an exposed brain in a see-through protective helmet and torn bits of flesh revealing the sinew underneath, was painstakingly put together by a massive team

Hunk: Heidi's outfit was in fact part of a couple's costume with her third and current husband Tom Kaulitz, who was dressed as a newly murdered astronaut

Hunk: Heidi's outfit was in fact part of a couple's costume with her third and current husband Tom Kaulitz, who was dressed as a newly murdered astronaut

So sweet: Andy Cohen, celebrating his first Halloween since becoming a father, dressed as Snoopy to take his eight-month-old son Benjamin trick-or-treating in New York City

So sweet: Andy Cohen, celebrating his first Halloween since becoming a father, dressed as Snoopy to take his eight-month-old son Benjamin trick-or-treating in New York City

On the go: He had dressed his little pride and joy as Snoopy's sidekick Woodstock and could be spotted carrying him down the city streets to collect some candy

On the go: He had dressed his little pride and joy as Snoopy's sidekick Woodstock and could be spotted carrying him down the city streets to collect some candy

smoldered in a barely-there costume as Elle Woods, Reese Witherspoon's character in the beloved 2001 comedy movie Legally Blonde.

The reality TV bombshell specifically chose the sparkling green bikini and blonde ponytail that Elle wore as part of her video application to Harvard Law School.

In the relevant part of the movie, Elle lays on a pink floatie while bragging: 'I'm able to recall hundreds of important details at the drop of a hat' - a skill she demonstrates by reciting plot points on Days Of Our Lives.

Kim, also an aspiring lawyer, recreated the entire video essay verbatim for a video posted to her Instagram page, modeling facsimiles of all the outfits Reese wore in the movie version.

Pucker up: Kim Kardashian smoldered in a barely-there costume as Elle Woods, Reese Witherspoon's character in the beloved 2001 comedy movie Legally Blonde

Pucker up:  smoldered in a barely-there costume as Elle Woods, Reese Witherspoon's character in the beloved 2001 comedy movie Legally Blonde

What a look: The reality TV bombshell specifically chose the sparkling green bikini and blonde ponytail that Elle wore as part of her video application to Harvard Law School

Remember when: In the relevant part of the movie, Elle lays on a pink floatie while bragging: 'I'm able to recall hundreds of important details at the drop of a hat' - a skill she demonstrates by reciting plot points on Days Of Our Lives

What a look: The reality TV bombshell specifically chose the sparkling green bikini and blonde ponytail that Elle wore as part of her video application to Harvard Law School

Sizzler: Kim, also an aspiring lawyer, recreated the entire video essay verbatim for a video posted to her Instagram page, modeling facsimiles of all the outfits Reese wore in the movie version

Sizzler: Kim, also an aspiring lawyer, recreated the entire video essay verbatim for a video posted to her Instagram page, modeling facsimiles of all the outfits Reese wore in the movie version

Variety: A number of Elle Woods costumes were on display via Kim's Instagram page

Variety: A number of Elle Woods costumes were on display via Kim's Instagram page

Her mother and momager Kris Jenner went for a full Dia De Los Muertos look, wearing themed makeup and a mariachi band uniform including a sombrero. 

Irina Shayk and her two-year-old daughter Lea De Seine, whom she shares with her ex Bradley Cooper, were dressed up in matching Minnie Mouse outfits for their trick-or-treating outing. 

Catherine Zeta-Jones, 50, and Michael Douglas, 75, pulled out the stops at Bette Midler's annual Hulaween charity gala in New York on Thursday.

For the star-studded Halloween party, Catherine channeled Old

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