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KATY PERRY: HILLARY CLINTON
Perry channeled the presidential candidate for this year's festivities, opting for prosthetics and a crimson pantsuit reminiscent of the White House hopeful's signature style.
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With the help of daughter Blue Ivy, the "Hold Up" singer pulled out all the stops for this year's costume, paying homage to the hip-hop girl group Salt-N-Pepa from the music video for "Push It." Beyoncé sported a black bobbed wig, gold chain and oversized jacket while Blue appeared to wear a white bodysuit, high-top sneakers and a jacket to match her mom's.
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KYLIE JENNER: CHRISTINA AGUILERA
The 19-year-old channeled old-school Xtina in the singer's 2002 music video for "Dirrty." Jenner opted for blonde hair, a nose piercing and chaps to complete her look.
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NINA DOBREV: RYAN LOCHTE
Dobrev copied Ryan Lochte's Rio Olympics look on Saturday, with friend Lane Cheek accompanying her as swimmer Jimmy Feigen.
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MILEY CYRUS: LIL' KIM
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MATTHEW MORRISON: ANDY WARHOL
The Glee star took a break from wedding planning to channel the iconic camera-wielding artist Andy Warhol at his lavish Halloween birthday bash in Los Angeles on Oct. 26.
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KELLY OSBOURNE: CHRISTINA HENDRICKS
Christian Siriano made the lucky Fashion Police host an identical replica of the red-carpet dress he designed for the flame-haired Mad Men star, but the style expert admitted she needed a little help to achieve the actress's famous curves, confessing
on Instagram, "I had to wear 3 bras!!"
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CINDY CRAWFORD & RANDE GERBER: SLASH & AXL ROSE
The usually glam supermodel and her handsome hubby stepped back in time – and into their skinniest jeans – to morph into the big-haired '90s-version of the Guns 'n' Roses rockers.
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