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In alengthy Facebook post, Rossum reflected on joining the TV family thats become Showtimes highest-rated series.

See, in real life, unlike Fiona, Im an only child.
I never had a big family.
Being ensconced in that messy Gallagher family love is something Id always dreamed of.
But even off set, it feels real, she writes.
The opportunity to play Fiona has been a gift.
There are few characters female or otherwise as layered and dynamic.
She is a mother lion, fierce, flawed and sexually liberated.
She is injured, vulnerable, but will never give up.
She is living in an economic depression, but refuses to be depressed.
I knew it the second I read the pilot script, this was different, this was special.
It has not yet been renewed for a tenth season, though Rossum hints that it will.
(Vulture has reached out to Showtime for comment.)
She writes, I know you will continue on without me, for now.
There is much more Gallagher story to be told.
I will always be rooting for my family.
Try not to think of me as gone, just think of me as moving down the block.
We were saddened when Emmy Rossum let us know that the upcoming ninth season ofShamelesswould be her last.
On behalf of everyone at Showtime and her millions of fans, we thank you Emmy!
Emmy Rossum will forever be part of theShamelessfamily.