Scott Wolf
The Party of Five and V alum played the dangerous Casey Stratton in two episodes.
Lily Tomlin
Tomlin took on the role of the McGee's grandmother on the CBS hit series.
Gaius Charles
The Friday Night Lights star had a recurring role as arson investigator Det. Jason King in season nine.
Cheryl Ladd
Ducky was quite the lucky duck when he landed this gorgeous Charlie's Angels alum as his love interest.
Perrey Reeves
Reeves, who played Ari's long-suffering wife on Entourage, tackled the role of Tony's ex-fiancee.
Diane Neal
The Law & Order: SVU actress fights crime here too. Her NCIS character Special Agent Abigail Borin pops up on a recurring basis.
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Jamie Lee Curtis
Star Mark Harmon's Freaky Friday costar played his onscreen love interest once again as Dr. Ryan.
Robert Wagner
Wagner has appeared severl times on the show as DiNozzo's father.
Ralph Waite
The Waltons actor has appeared several times to play Gibbs' father.
Shanna Moakler
The former pageant queen played the the girlfriend of one of the team's victims in a season-seven episode.
Gena Rowlands
The celebrated actress played Joann Fielding, Gibbs' upscale mother-in-law.
Antonio Sabato Jr.
The soap stud guest-starred in a 2008 episode.
David Eigenberg
The Sex and the City alum (Steve!) played a former NSA Analyst. Miranda would be so proud!