Two more Big Bang Theory stars are set to get paid US$1 million per episode.

According to insiders who spoke to The Hollywood Reporter, Simon Helberg and Kunal Nayyar are close to signing new contracts which will see them get paid the same amount as the show's three main stars.

Jim Parsons, Johnny Galecki and Kaley Cuoco renegotiated their salaries back in 2014 before filming season eight and secured a pay rise from US$325,000 per episode each to $1 million per episode.

All of the show's stars are expected to sign on the dotted line to appear in another two seasons of the sitcom [season 11 and season 12] with CBS Corp. CEO Leslie Moonves saying the deal to extend the show is "very very close" to being finalised.

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It's not known if season 12 will be the show's last, but if they're pocketing a million bucks per episode, you can bet the show's stars will be hoping it isn't.

The sitcom started in 2007, and follows a group of scientists and pop culture nerds. It currently airs on TVNZ 2.