The "Applause" hitmaker recently debuted her new look in a picture she posted on Twitter.
"I heard you called for a blonde @MrRPMurphy #AHSHotel," she captioned the image showing her sitting on the passenger seat of a vintage car.
She also documented the process of her hair makeover in a series of Instagram pictures.
"American Horror Story: Hotel" recently added "Girls" star Max Greenfield to the cast.
He joined the previously announced cast members including Gaga, Kathy Bates, Sarah Paulson, Angela Bassett, Evan Peters, Wes Bentley, Chloe Sevigny, and Matthew Bomer.
Plot details have been kept under wraps as filming is set to begin next month in LA.
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