'Secret Circle' Shelley Hennig had 'no boundaries' in scene

Shelley Hennig has teased that Diana will be "pushing the limits" in this week's episode of The Secret Circle.

In the instalment, which airs tonight at 9/8c on The CW, Melissa (Jessica Parker Kennedy) will give Diana some "devil's spirit".

Hennig has now told TV Line that the spirit has a similar effect to alcohol.

"Diana's really sensitive to the drug, and it really gets to her," she said. "She becomes quite a fun character."

Hennig also admitted that she is nervous about the episode because she had "no boundaries" while she was filming the scenes.

She teased: "They can't show everything, but you'll definitely see Diana pushing the limits, especially with Lee [Grey Damon]."

Hennig recently confessed that she would love Diana to be the second Balcoin child but said that none of the cast know which character it is.

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Watch a preview for the next episode of The Secret Circle below: