A breakout trend from the spring 2020 runways, ’60s-era fashion proved an easy last-minute costume for this weekend’s party circuit. At the Casamigos Halloween Party in Beverly Hills, Amber Valletta, Zoey Deutch, and Kaitlynn Carter took cues from the likes of Mary Quant, Twiggy, and even Austin Powers. Emily DiDonato was transformed into She-Hulk by the makeup artist Erin Parsons, who also did an over-the-top smokey eye on Jason Wu for his Victor/Victoria Halloween Party and a lion look on Adriana Lima earlier this week. As far as musicians dressing up as other musicians, Halsey did her best homage to Marilyn Manson on Friday, going the extra mile with mismatched contacts. The singer Anne-Marie, who channeled Billie Eilish in her slime green phase, was one of many who dressed up as the angsty teen pop star this weekend: Nina Dobrev went for black tears and an oversize Louis Vuitton sweatshirt Billie Eilish, while Jameela Jamil did a twist on the concept as Silly Eilish. For those of us who can’t commit to a full face of makeup, Mei Kawajiri showed off relatively subdued purple and orange talons, while the makeup artist Kale Teter and Karolina Kurkova made the case for a subtle orange lipstick to show one’s fall spirit. Plus: Heidi Klum embraced the Euphoria effect with full-body glitter, Demi Lovato was a royal beauty as Marie Antoinette (pre-decapitation), and Jazzelle Zanaughtti gave Joaquin Phoenix’s Joker a run for his money, below.