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Lea Michele is giving Julia Roberts a run for her money.

The Scream Queens star will be slipping into a Pretty Woman costume for Halloween.

"I watched the movie on TV the other night and I ordered the costume on Amazon," Michele told me exclusively last night at amfAR's Inspiration Gala.

She didn't, however, have to worry about Vivian's iconic knee-high boots. "They're my own boots that I own," Michele said.

Michele's stylist and pal Brad Goreski will be doing some gender bending this weekend.

Lea Michele, Brad Goreski, amfAR

Kevin Tachman/Getty Images for amfAR

"Tomorrow night I'm going to be Ariana Grande in an outfit inspired by her Snapchat," the Fashion Police star said. "I'm Ariana Grande's number one fan." (Just for the record, Michele insisted she's the "Dangerous Woman" singer's number one fan!)

Goreski's second costume? He beamed, "I'm going to be Lady Gaga a la Joanne."

Yas, queen!

Michele and Goreski sat at a table at the gala with Heidi Klum, designer Kenneth Cole, Jason Derulo and American Horror Story's Cheyenne Jackson. The besties were two of the first people out of their seats to start dancing during Derulo's performance at the end of the fancy fundraiser.

Michele stunned in an Elie Saab gown with diamonds from Harry Winston that she handpicked earlier in the day during a visit to the legendary jewelry house's Beverly Hills flagship store.

Pretty woman, indeed.

More than $2 million was raised for the HIV/AIDS organization.