Halsey channeled her inner Poison Ivy for Halloween (Picture: Instagram)

Halloween is upon us once again, and the celebrities have been showing us how to do dress-up the right way.

Some famous faces seriously went all out for their spooky bashes. We’re looking at you, Halsey, or should we say Poison Ivy.

The Bad At Lover singer got over her G-Eazy heartbreak in style, opting for a very risqué costume to party the night away in.

She rocked a tiny green bikini for the night, with ivy-embellished heels and let green body paint do the rest of the talking for her.

LAS VEGAS, NV - OCTOBER 27: Kendall Jenner attends Casamigos Halloween party at CATCH Las Vegas at ARIA Resort & Casino on October 27, 2018 in Las Vegas, Nevada. (Photo by Kevin Mazur/Getty Images for Casamigos)
Kendall Jenner became a fembot and we are obsessed (Picture: Getty)
LAS VEGAS, NV - OCTOBER 27: Kendall Jenner attends Casamigos Halloween party at CATCH Las Vegas at ARIA Resort & Casino on October 27, 2018 in Las Vegas, Nevada. (Photo by Kevin Mazur/Getty Images for Casamigos)
Kendall looked incredible as she transformed into an Austin Powers character (Picture: Getty)

The 24-year-old completed the look with an epic bright red wig, giving us Halloween inspo for days.

Kendall Jenner also took the opportunity to don a wig as she headed out to the second Casamigos party over the weekend, going Barbie blonde for the big night.

And she proved she can literally make any look work, morphing into a fembot from Austin Powers.

The 23-year-old wore a slinky, sheer pink negligee as she celebrated Halloween at a star-studded event, with fluffy lining, satin gloves and the tiniest bag we have ever seen.

Seriously, what can she even fit in there?

BEVERLY HILLS, CA - OCTOBER 26: Harry Styles attends the Casamigos Halloween Party on October 26, 2018 in Beverly Hills, California. (Photo by Kevin Mazur/Getty Images for Casamigos) **BESTPIX**
Is it Harry Styles or Elton John? (Picture: Getty)

Her evening out comes after she avoided a run-in with ex Harry Styles, who partied up a storm at Casamigos’ first party.

Where were our invites to either party, eh?

The Sign Of The Times singer channelled his inner Elton for the Tequila brand’s celebrations, in a bedazzled LA Dodgers uniform, and glittery pink sunglasses we desperately need in our lives.

Hazza isn’t the only famous face who dressed up as another famous face for their Halloween costume this year.

Nicky Hilton seen at the ???Casamigo???s??? Halloween party in Beverly Hills, CA Pictured: Nicky Hilton Ref: SPL5036828 271018 NON-EXCLUSIVE Picture by: SPW / SplashNews.com Splash News and Pictures Los Angeles: 310-821-2666 New York: 212-619-2666 London: 0207 644 7656 Milan: +39 02 4399 8577 Sydney: +61 02 9240 7700 photodesk@splashnews.com World Rights,
Nicky Hilton kept it in the family for Halloween (Picture: Splash)
LONDON - MAY 3: Paris Hilton celebrates her 21st Birthday Party at the Stork Rooms in Swallow Street on May 3, 2002 in London. (Photo by Dave Benett/Getty Images)
Nicky got her Halloween inspo from Paris Hilton  (Picture: Getty Images)

In fact, Nicky Hilton went one better and decided to go as her sister, Paris, for the evening.

The mum-of-two got her inspiration from the Simple Life star’s iconic 21st birthday party dress, and we are honestly not worthy.

She paid tribute in a slinky, diamond encrusted mini-dress, with matching diamond choker and a glittery clutch bag, giving us all a reminder of how good just noughties were in the style stakes.

Sophie Turner and Joe Jonas decided to forgo the whole ‘couple costume’ idea this year, and just did their own thing.

West Hollywood, CA - *EXCLUSIVE* Best Costume winners? Joe Jonas and Sophie Turner get creative with their costumes at Kate Hudson's party. Sophie is dressed as an elephant while Joe appeared to go as a hairy version of his fiance's Game of Thrones character Sansa Stark. Pictured: Joe Jonas, Sophie Turner BACKGRID USA 28 OCTOBER 2018 USA: +1 310 798 9111 / usasales@backgrid.com UK: +44 208 344 2007 / uksales@backgrid.com *UK Clients - Pictures Containing Children Please Pixelate Face Prior To Publication*
Joe Jonas and Sophie Turner won the couple Halloween costume competition (Picture: Backgrid)

In fact, the Game Of Thrones actress gave us the biggest Halloween goals of all time as she dressed as an elephant for the evening, and it is a total mood.

Whereas her DNCE singer fiancé went one better and channelled his inner Anna from Frozen… We think?

Whatever it is, we are obsessed.

https://www.instagram.com/p/Bpcd0qqnbNj/?taken-by=rossbutler

Noah Centineo also decided to dip into his Disney diva and went out for Halloween dressed as Gaston from Beauty And The Beast, but way, way better than Gaston ever could be.

The To All The Boys I’ve Loved Before star, aka Peter Kavinsky, partied with Ross Butler – who rocked a Wolverine costume – giving us the crossover we’ve all been waiting for.

We already can’t wait until next year.

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