Who Plays Cecilia in ‘The Flight Atttendant’?

In real life, Cecilia is played by Briana Cuoco, Kaley’s little sister. According to Briana’s IMDb page, Briana was born on Nov. 29, 1988, while Kaley was born on Nov. 30, 1985.

Did you know Briana appeared in another of Kaley’s shows? She played the character Gretchen on one episode of The Big Bang Theory. She’s also appeared in a variety of other television programs, like Criminal Minds, NCIS, and even Curb Your Enthusiasm.