7 PM

Christina Aguilera just gave Kylie Jenner her costume seal of approval.

Over the weekend Kylie dressed up just like Christina in her 2002 "Dirrty" music video and pretty much won Halloween! Kylie looked just like Christina in her bikini top and leather chaps.

So when Christina saw Kylie's epic costume on Sunday, she responded by reposting a photo of the Keeping Up With the Kardashians star on Instagram.

"YAASSSSS".....Killin it @kyliejenner yes to dirrty 2016!! Get it girrrl!!!" Christina captioned the post.

So cool!

So what else did celebs dress up as over the weekend?

Take a look at the E! News video above to get the scoop on Hollywood's Halloween!

Don't miss E! News every weeknight at 7, only on E!

Watch the season 16 premiere of Keeping Up With the Kardashians Sunday, Mar. 31 at 9 p.m., only on E!

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