She is having a torrid affair with the A- lead actress on one of the shows in which she appears

This married actress is foreign born.

She is currently starring in two huge television shows.

Big ones. Oh, and she is an Emmy nominee/winner.

Anyway, she is having a torrid affair with the A- lead actress on one of the shows in which she appears.

Way fewer episodes in that show, but still just as popular.

First time blind item appearance for her, but definitely not for the A- lister.

A- lister: Gillian Anderson
Married actress: Archie Panjabi

Source: http://www.crazydaysandnights.net