Here's a couple of episode stills from the Parks and Recreation Season 5 Episode 9 Ron and Diane. Promo images are courtesy of NBC and TV|Line. Photographer: Chris Haston. Unfortunately we don't have a clear shot of Lucy as Diane (except for the one photo where she's partially hidden (Photo #1) and the others it's either the back of her head or blurry.

Is it significant that both "Diane" and "Tammy Two" are both wearing red?

LOG LINE:
Ron (Nick Offerman), Diane (guest star Lucy Lawless), and Leslie (Amy Poehler) attend a wood working awards dinner, after one of Ron's handcrafted chairs is nominated, but the happy occasion is threatened by the arrival of Tammy II (guest star Megan Mullally).

 

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Source: TV|Line and NBC

For more about Lucy's role as Diane on Parks and Recreation Season 5 visit the AUSXIP Lucy Lawless Parks and Recreation subsite