Jen Aniston's buzzed-about guest-starring role on Wednesday's Cougar Town didn't drum up ratings for the ABC sitcom.

Around 12.6 million viewers watched the season premiere of the Emmy award-winning Modern Family -- a successful bow.

A large chunk of those viewers didn't stick around 30 minutes later to watch Aniston, 41, reunite with Courteney Cox on Cougar Town.

According to estimates, 8.3 million viewers watched the show, which featured Aniston as a shrink.

It placed third in its timeslot.

Last year's series premiere drew 11.4 million viewers.

Lately, Aniston has been in the doghouse. ratings-wise.

Her last big screen comedy, The Switch, flopped, grossing just $8.1 million its opening weekend in August.