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Influencer Diademlori greeted her guests as a larger-than-life spider. The costume: completely self-designed – and sewn by her mother.

Photo: diademlori / Instagram

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Musician Justin Bieber appeared quite casual at a Halloween party in Los Angeles - with diving fins and Hawaiian shirt.

Photo: Matt Winkelmeyer / Casamigos / Getty Images

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It-girl Paris Hilton's costume (center) was a tribute to her friend Britney Spears, who wore such a blue costume in the 2004 music video for "Toxic."

Photo: Matt Winkelmeyer / Casamigos / Getty Images

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Jessica Alba (left) was also inspired by a Britney music video: The actress based her costume on Spears' appearance in »... Baby One More Time«.

Photo: jessicaalba / Instagram

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Influencer Sophia Thiel turned into the devil himself with the help of a body art artist.

Photo: sophia.thiel / blackcat_bodyarts / Instagram

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US Democrat Alexandria Ocasio-Cortez (left) dressed up as the children's book character "Waldo" this year.

Photo: aoc / Instagram

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The »Riverdale« stars Camilla Mendes, Lili Reinhart and Madelaine Petsch are already on the road as a trio for the second time, this year straight outta Gotham City.

Photo: madelame / lilireinhart / Instagram

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Influencer Twenty4Tim (front left) was part of a horror group this year: "We thought about it for a long time and then we came up with the idea for the group costume," he writes on Instagram, "MR GRINCH & MRS GRINCH!"

Photo: twenty4tim / Instagram

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