Amal Clooney pulled out all the stops with her retro, '70s-inspired Halloween [1] costume this year. The 39-year-old human rights lawyer, who welcomed twins Ella and Alexander [2] with husband George in June, dressed up as a disco diva — big wig included — when she attended the Casamigos Halloween Party in West Hollywood on Friday night. Amal completed her look with glittery flared pants, a bustier top, and oversize sunglasses [3]. Model Cindy Crawford [4] also served major disco fever vibes with her similar costume. The two were spotted posing for photos throughout what appeared to be a fun night. Keep reading to see more of Cindy and Amal's gorgeous costumes.