KALEY Cuoco is keeping it in the family.

The Big Bang Theory star has cast her sister in her next project – HBO Max’s The Flight Attendant.

The 34-year-old actress is starring alongside her sister Briana, according to Deadline.

The star – who is the second highest paid television actress in the US – is also executive producer of the dark comedic thriller.

Briana, 31 – who was a contestant on NBC’s The Voice Season 5 – plays Cecilia, a quirky and ambitious assistant who’s obsessed with organisation and eavesdropping on calls.

Kaley stars as Cassie, a flight attendant who wakes up in the wrong hotel, in the wrong bed, with a dead man – and with no idea what happened, reports Deadline.

Briana has previously been seen on television in Mom, The Newsroom, The Mentalist, NCIS, Criminal Minds, and The Big Bang Theory.

The choreographer has also danced alongside Ne-Yo, Pitbull, Big Time Rush, Snoop Dogg and on TV shows Glee and America’s Got Talent.

The Flight Attendant also stars Sonoya Mizuno, Michiel Huisman, Colin Woodell, Zosia Mamet, Merle Dandridge and Griffin Matthews.

It is based on the novel by New York Times best-selling author Chris Bohjalian.

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