Netflix's original series "The Crown" is based on the real-life royal drama behind Queen Elizabeth II's reign as the British monarch.

original series "The Crown" is based on the real-life royal drama behind Queen Elizabeth II's reign as the British monarch. The third season features an all-new cast, to reflect the aging of the characters.

Here's how the actors, both old and new, look in real life compared to their regal on-screen personas.

The first season of Netflix's original drama "The Crown," a retelling of Queen Elizabeth II's rise and reign as the British monarch, cost $100 million to make. That makes it one of the most expensive TV series of all time, just behind HBO's "Game of Thrones."

But it certainly seems like the investment is worthwhile. "The Crown" is adored by critics and has picked up two Golden Globes. The third season — featuring an all-new cast, to reflect the aging of the characters — was made available to stream on Sunday.

Part of that monster budget goes to dressing the cast in a wild number of transformative period costumes.

See how the actors, both old and new, look in real life compared to their regal on-screen personas.

Caroline Praderio contributed to an earlier version of this post.