The high-profile guest stars keep on coming.

In this new sneak preview of tonight's episode, "An Honest Mistake," Faye Dunaway appears as Dr. Campbell, the first (and now oldest) female surgeon at Seattle Grace, whose recent surgery mishap is the focal point of ridicule from other doctors behind her back.

Watch out once she overhears, though ...

[video url="http://www.tvfanatic.com/videos/an-honest-mistake-sneak-preview-2/" title="An Honest Mistake Sneak Preview #2"][/video]

Follow the jump for three more sneak previews of tonight's episode, which brings us to the conclusion of the Grey's Anatomy-Private Practice event ...

[video url="http://www.tvfanatic.com/videos/an-honest-mistake-sneak-preview-3/" title="An Honest Mistake Sneak Preview #3"][/video]

[video url="http://www.tvfanatic.com/videos/an-honest-mistake-sneak-preview-4/" title="An Honest Mistake Sneak Preview #4"][/video]

[video url="http://www.tvfanatic.com/videos/an-honest-mistake-sneak-preview-5/" title="An Honest Mistake Sneak Preview #5"][/video]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.