United Kingdom, Nov. 22 -- Sadie Sink wasn't allowed to listen to pop music as a child.

The Stranger Things star - who is reprising her role as Max Mayfield in the fifth and final season of the Netflix juggernaut - has recalled her parents Lori and Casey's strict rules for Sadie and her four siblings when they were growing up.

She told ELLE Australia: "We weren't really allowed to listen to a lot of pop music, but our loophole was musical theatre songs."

Instead, she and her siblings turned to the likes of The Sound of Music and Hairspray, and Sadie secretly watched Grease even though her parents didn't approve.

The 23-year-old actress - whose most iconic scene from Stranger Things was set to Kate Bush's classic Running Up That Hill -...