The actress will play a "temptress" in the NBC comedy's seventh run, according to TVLine.
© WENN
© NBC Universal
Mader's past credits include roles on No Ordinary Family, Fringe and White Collar. She also starred in ABC's short-lived cross-dressing comedy Work It.
30 Rock star Jack McBrayer (Kenneth) recently admitted that it is "getting emotional" on the show's set as the end of the series approaches.
Alec Baldwin (Jack Donaghy) has also claimed that he will never enjoy a job as much as he has loved 30 Rock.
"I think mostly people are very sad [about the show ending], because it's been a great experience and we'll never be able to duplicate this again," Baldwin said in October.
30 Rock continues on Thursdays at 8/7c on NBC. In the UK, Comedy Central airs the series.
> 30 Rock Dean Winters returning?
> Elementary, 30 Rock halt filming due to Hurricane Sandy
Watch a clip from 30 Rock below:
