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Jane Lynch is trading her megaphone for mom jeans in her iCarly debut on the upcoming episode "iSam's Mom," on Nickelodeon.

Jane Lynch to be a mom — on iCarly

The Glee Emmy winner plays Pam, cranky mom to Sam (Jennette McCurdy). In this exclusive sneak peek, Carly (Miranda Cosgrove) convinces the bickering pair to see a therapist to work out their differences. And that's where the trouble starts.

"You married? I don't see a ring. You got a woman or what?" Pam asks the therapist. "Pardon my mommy's desperation," Sam sarcastically responds.

The Sept. 11 episode (8/7c) is the first appearance of Sam's sassy, eccentric mom, who has a colorful dating life, horrible driving skills, and questionable hygiene.

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What do you think about Lynch's iCarly guest spot?