EXCLUSIVE: Sarah Paulson Explains Her Odd 'Ocean's Eight' Nickname, Cast Pact to Keep It Cool Around Rihanna

ET chatted with the 'American Horror Story; Roanoke' actress before the show's PaleyFest panel in Los Angeles.

Sarah Paulson is one busy lady, with multiple movie and TV projects in the works for 2017.

“I like to work,” she tells ET. “I’d rather work than sit at home on my expanding a**.”

Speaking of Paulson’s behind, it turns out her backside was a hot topic on set of Ocean’s Eight, where the crew gave her the nickname, “Long Butt Dong.”

“You can call me Long Butt Dong,” she jokes. “It's true. I did wear pants that did communicate a long butt.”

Raymond Hall

WATCH: Sarah Paulson Spills Details From the Ocean’s Eight Group Text

Paulson notes she was the only actress who fell victim to a nickname on set. She says the cast, which includes Sandra Bullock, Mindy Kaling and Anne Hathaway, were all too busy trying to keep their cool around co-star Rihanna to give each other pet names.

“A lot of us spent a lot of time not singing Rihanna songs,” she shares. “We all sort of covertly were like, 'Are you doing it, too?'”

Paulson says the whole cast would get the urge to start humming RiRi’s hits when the singer-turned-actress was around.

“Everyone would be like, 'Stop,’” Paulson recalls, in a whisper. “It was a lot of collective winking.”

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Paulson calls Rihanna “one of the coolest gals around.”

“You don't want to be a supreme doofus-magoofus in front of Rihanna,” she says. “You wanna keep a little bit of a cool quotient, which I, as you can tell, I'm not super successful at.”

Well, we’d beg to differ. Paulson kept her cool at PaleyFest in Los Angeles on Sunday night, which is where ET caught up with the star.

Paulson joined her American Horror Story: Roanoke cast onstage for the event, where co-star Kathy Bates repeatedly referred to her as “the People’s Princess.” It seemed like a nod to Princess Diana, who will be the focus of the second season of FX’s anthology series, Feud.

So, could Paulson be playing the late royal on the show? Check out the video below to learn more.