Stars gettin’ spooky on HalloWeekend: All the best celebrity Halloween costumes!

Kylie Jenner and her BFF Anastasia Karanikolaou nailed their duo costume. The reality star and her gal pal completely transformed into Madonna and Britney Spears for HalloWeekend, sharing posting their looks to social media on Saturday, October 26. Videos showed the pair giddily dancing around and putting on a mock performance of Like A Virgin ahead of going for an epic moment. In the end, they went in for Britney and Madonna's legendary 2003 MTV VMA's kiss.

Halsey and Evan Peters made their love red carpet official at the American Horror Story 100th Episode Celebration on Saturday, October 26. The couple got festivie as one of the most well-known duos of all time: Sonny and Cher.

AHS leading ladies Sarah Paulson, Leslie Grossman and Billie Lourd were #SQUADGHOULS at the star-studded FX bash.

Casamigos concocted its annual "Brought to You by Those Who Drink It" bash at co-founder Mike Meldman's home in Beverly Hills on Friday, October 25. As usual, fellow founder Rande Gerber was in attendance with his star wife Cindy Crawford. The pair arrived matching the party’s psychedelic theme with groovy attire. Plus, did you notice which star appears on Rande's shirt?

Meanwhile, this husband and wife duo stole the show at the event. Jessica Biel turned up dressed as her husband Justin Timberlake, who in turn went as a microphone. The lovebirds were spotted as part of an N'Sync dressed group costume.

Paris Hilton put a sultry spin on a Western showgirl for the epic bash.

Once upon a dream Eiza González was inspired by Angelina Jolie’s Maleficent and we loved every moment.

RELATED: Watch Angelina Jolie transform into Maleficent

In a cool turn of events, Laverne Cox reminded herself to “embrace imperfection” by last-minute creating her own look for the holiday. “This year no stylist, no makeup artist, no hair stylist. Just me and my creativity, like the old days,” she wrote on social media. “I had so much frantic fun shopping for this look by myself just a few hours before the party started.” The Orange is the New Black star didn’t have anything in particular in mind, but instead beckoned her fans to give the character a name.

We are not worthy of Lisa Rinna’s briliant homage to Jennifer Lopez. The Real Housewives star strutted into the bash with the costume of our dreams: JLo’s iconic Versace jungle print look from the 2000 Grammys .

Nina Dobrev killed it as Billie Eilish, green roots and all.

Shanina Shaik and her date channeled Catherine Zeta-Jones and Antonio Banderas in The Legend of Zorro for Paris Hilton’s Halloween gathering. The model certainly looked the part in a lacey white corset dress with a thigh-high slit.

For her first costume of 2019, Queen of Halloween Heidi Klum seemed to be inspired by all things that glitter pop. The model and her love Tom Kaulitz were bursting with love over the festive weekend.