The three ages of guesting. (Jeffrey Mayer; Jeffrey Mayer; John Parra/all WireImage.com)Actors have day jobs, but with an eye on a paycheck, a fun day's work, or an Outstanding Guest Actor Emmy, they moonlight in TV guest roles, too. Here are a few performers (and one non-performer) who will soon provide their Guest Services.
Actor: Frances Sternhagen
Day Job: Playing everyone's mother, from Cliff Clavin ("Cheers") to Trey MacDougal ("Sex & the City")
Guest-Starring On: "Parenthood"
Role: Mother (what else?) to Zeek (Craig T. Nelson)
Pros: She can probably do this role in her sleep.
Cons: By playing yet another stuntcast mom, she risks a beatdown from current record-holder Marion Ross.


