The People v. O.J. Simpson: American Crime Story star features alongside the Bajan beauty in the forthcoming Ocean's Eleven spin-off movie, but Sarah admits she and her fellow castmates, including Sandra Bullock, Anne Hathaway, and Cate Blanchett, were all in awe of the pop superstar.

"A lot of us spent a lot of time not singing Rihanna songs," she told Entertainment Tonight. "We all sort of covertly were like, 'Are you doing it (humming), too?' Everyone would be like, 'Stop!'. It was a lot of collective winking."

Sarah was even more eager not to make a fool out of herself in front of Rihanna, because she proved herself to be "one of the coolest gals around".

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

Ocean's Eight, an all-female reboot of the heist films, also stars Helena Bonham Carter and Mindy Kaling, while other castmembers include Matt Damon, Damian Lewis, Dakota Fanning, and James Corden.