Megan Mullally

It's as if Tammy 2's ears were ringing! Just as Ron Swanson has found a possible new love interest, she comes back to Parks and Recreation!

Megan Mullally will reprise her role as the second ex-wife of Ron (Nick Offerman) in this season's ninth episode, fittingly titled "Ron and Diane," TVGuide.com has learned exclusively. Tammy will once again stir up trouble for Ron, who has only recently started a possible fling with Pawnee citizen Diane (Lucy Lawless).

Parks and Rec Video: Ron finds love with someone not named Tammy in Lucy Lawless

Beginning in Season 2, Parks started an annual tradition featuring Ron's eccentric ex-wives, beginning with "Ron and Tammy," followed by "Ron and Tammy: Part Two" in Season 3, and "Ron and Tammys" in Season 4, in which his first ex-wife Tammy (Patricia Clarkson) and his mother Tammy (Paula Pell) came to town.

Best known for playing Karen Walker on Will & Grace, Mullally, who's married to Offerman in real life, has recently appeared on Happy Endings, Party Down and Childrens Hospital.

Parks and Recreation airs Thursdays at 9:30/8:30c on NBC.