Paris Hilton Dons Britney Spears Costume at Casamigos Halloween Party

Hollywood’s scariest evening was chock-full of costume and make-up-wearing celebs … however it was Paris Hilton who actually turned heads when she walked in as Britney Spears!!!

Paris hit L.A.’s hottest Halloween celebration — Casamigos — Friday evening with a slew of A-listers, and she or he stood out from the pack in her horny blue stewardess outfit identical to the one Britney wore in her 2003 music video for her hit track, “Toxic.”

Given all of the Britney information — and drama — of late, Paris will get an A+ on her Halloween report card for selecting to seem as an excellent related popular culture determine.

The remainder of the visitor checklist was additionally horrifying in its star energy. Feast your eyes on these bold-faced names … Justin Bieber, MGK, Megan Fox, Ed Norton, Invoice Maher, David Spade, Cindy Crawford, Rande Gerber, Austin Butler, Kaia Gerber, Tobey Maguire, Len Wiseman, Brett and Jason Oppenheim, Rachel Lindsay, Brock O’Hurn, Tyga, Saweetie, Alessandra Ambrosio, Paris Jackson, Molly Sims & Scott Stuber, Lauren Conrad, Charlotte McKinney, Sara Sampaio, Rachel Zoe & Rodger Berman, Robin Thicke.

A few of their get-ups have been fairly freaky, too … MGK and Megan went all Quentin Tarantino, dressing up as two bloodthirsty murderers from his “Kill Bill” films.

The celebration was killer as nicely. It was held in a non-public home in Bev Hills and was filled with costumed revelers.

Everybody was consuming booze from the open bar and munching on tater tots, pizza, grilled cheese and sliders. We’re instructed the vibe was nice throughout and other people had an superior time.

However don’t overlook kiddos … Halloween doesn’t formally kick off till Tuesday.