9 Last-Minute Celebrity Halloween Costumes That Are Already in Your Closet

The keys to transforming into America's pop princess? A gray cardigan, a white button-down shirt (tied ever so seductively around the waist), a hot pink bra, a black miniskirt, knee-high socks, clunky black shoes, and pigtails. Do not—I repeat—do not forget the pigtails.

Grab a form-fitting black minidress and high heels and tie your hair into an alarmingly high ponytail. Cat ears optional. 

The wig says it all, really. (But if you can't locate a wig store in time, mega bangs, black and white hairspray, and the largest bow humanly possible will do.) 

Throw on a black suit and borrow your brooding biker friend's helmet.

Dig up the Juicy sweatsuit hiding in the back of your closet, grab a pair of oversize sunglasses, and a blonde wig (if you're not a natural blonde). Bonus points for a chihuahua.

Wear a colorful pantsuit, a bob wig, and walk with purpose, ideally to the White House.

Straighten your hair, slip on a tight, cleavage-baring (and preferably nude) dress, and finish the look with peep-toe boots (and a phone ripe for selfie-taking).

A pink hat, a pink blazer, extreme high heels, and—boom!—you're basically Lady Joanne.

Cement your reputation as a Halloween costume savant with slicked-back wet hair, a gray ripped sweatshirt, a choker necklace, red lipstick, and a brand-new persona.