Kelli Williams stars on Lie to Me as Dr. Gillian Foster.

With the show moving to 8 p.m. on Wednesdays starting tonight, the actress spoke to TV Guide about the big change.

TVGuide.com: As nice as it was to have the Idol lead-in, are you now nervous about having to kick off the night at 8 o'clock?
Kelli Williams: There's always a little concern when they start moving your show around, but it's good that we're at least on the same night. But yeah, I have one little concern. We were worried that maybe we'd lose some of the more adult themes, but so far so good

TVGuide.com: Tonight's episode packs quite the emotional wallop, with the case of a missing girl.
Williams: I know. It was quite something for my character, Foster, to deal with.... it puts Foster through quite a bit emotionally.

TVGuide.com: And that in turn gives us a bit more information on the perhaps-shaky status of her marriage.
Williams: It's interesting how that has been leaked out bit by bit. The part I like is that it isn't necessarily what you think it is. That will reveal more of itself in the next few episodes.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.