'Kardashians' star channelled Aguilera circa 2002 at a Halloween party over the weekend.

Christina Aguilera has endorsed Kylie Jenner’s decision to dress as her for Halloween.

The Kardashians star shared pictures of herself on Instagram herself over the weekend rocking Aguilera’s infamous ‘Dirrty’ look.

Diiiiiirty @xtina

A photo posted by Kylie (@kyliejenner) on

Released in 2002, ‘Dirrty’ and its provocative accompanying video showed a new, more grown-up side to Aguilera, who had previously been known for more PG-style pop hits.

Posting a picture of Jenner’s ‘Dirrty’ costume on her own Twitter and Instagram, Aguilera wrote: “”YAASSSSS”…..Killin it @kyliejenner yes to dirrty 2016!! Get it girrrl!!!

Kylie Jenner wasn’t the only celebrity to pick a unique Halloween costume over the weekend. Katy Perry and Orlando Bloom wore heavy prosthetic makeup to transform themselves into Bill and Hillary Clinton. In pictures, the couple look virtually recognisable from their everyday selves.

Meanwhile, Amy Schumer and her boyfriend Ben Hanish dressed as two of the kids from Stranger Things. Schumer wore a curly-haired wig to become Dustin, while Hanisch slipped into a pink dress and bloodied his nose to impersonate Eleven.

However, Hilary Duff and her boyfriend Jason Walsh have apologised for offending people after dressing as a pilgrim and a Native American for a Halloween party.

READ MORE: Here’s What Your Favourite Famous People Dressed Up As For Halloween