Lady Gaga Honors Ryan Murphy with a Rousing Performance at the amfAR Inspiration Gala

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We all transform into otherworldly creatures come Halloween, but Thursday night in Los Angeles, Lady Gaga proved that she's hands down the queen of costumery. The American Horror Story: Hotel star slipped out of the over-the-top ensembles she regularly slays in as the Countess of the Hotel Cortez, and instead reemerged as the slinky, jazzy songstress she embodied while touring Cheek to Cheek with Tony Bennett last summer.

And though we're sure eager little monsters awaited her arrival to Milk Studios, it wasn't just another performance that drew the star-studded crowd to Hollywood. Dressed in an elegant, cape-like, blush Valentino gown, the 29-year-old pop icon, who's rumored to release her highly-anticipated fifth studio album next year, stunned as she walked into the venue to fete amfAR's Inspiration Gala, where Horror Story creator Ryan Murphy was presented with the Inspiration Award for his work within the organization.

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Hosted by InStyle Style Icon Gwyneth Paltrow, the evening kicked off with memorable red carpet looks with the likes of Chloe Sevigny, Jamie Lee Curtis, Angela Bassett, and Rosie Huntington-Whiteley. It was those in Murphy's inner circle, though, who truly stole the show. Scream Queens star Lea Michele rocked a strapless orange Zac Posen dress with a matching old Hollywood inspired 'do, while Murphy sported a white tuxedo blazer.

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For Paltrow, the evening called for a mint silk Ralph and Russo gown made of chiffon with pleats down to the floor, along with shining Harry Winston jewels. The style stalwart wasn't alone. Former American Horror Story: Freak Show star and current scream queen Emma Roberts dazzled in a strapless dark floral number, while Diane Kruger killed it in a pink, slip-like Carolina Herrera piece.

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Inside of the glamorous affair, Murphy's lead actors mingled and chatted the night away. Roberts took a moment to sit and spend time with Sarah Paulson, who was in a perfectly tailored suit, and the always sexy Matt Bomber.

So what was the highlight of the evening? Gaga took the stage to perform hit jazz standards like "I Can't Give You Anything But Love," "La Vie En Rose," and her very own emotional ballad, "'Til It Happens to You." The evening also successfully raised well over $3.1 million to help amfAR and its battle against AIDS. We'd say it was an evening well spent.

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