'Big Bang Theory': Judy Greer to guest star

Guess who's making a guest appearance in Sheldon's bedroom?

A girl!

Warner Bros. TV confirms that actress Judy Greer -- of "13 Going on 30," "27 Dresses" and "Arrested Development" fame -- will appear on "The Big Bang Theory" later this season.

Greer's character will be a well-known scientist whom Sheldon (Jim Parsons) apparently finds worthy of spying his private quarters.

Yes, we said private quarters, not private parts. Let's be clear. The world hasn't gone completely mad.

Or has it?

Pumped to see Sheldon extend such an intimate invitation?

Weigh in below.

"The Big Bang Theory" airs at 9:30 p.m. ET Mondays on CBS.

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Photo credit: ABC