The 35-year-old shared that she and Derek Richard Thomas have split over a year after welcoming their daughter Louetta, 15 months.
"I am single momming it and coparenting," Rumer wrote on her Instagram Stories Aug. 22. "I'm so grateful for Lou. She is the best thing in my life and I'm forever grateful I was able to have the time in that relationship for her to come into my life."
Their split comes two months after the Vista Kicks frontman gushed over being a dad and his relationship with Rumer.
"Thank you for changing my life and transforming me into a better person," he wrote on Instagram in June. "Being your father is the greatest joy of my life. It's an honor to be your guide as you teach me how to live. Thank you for existing and thank you to your mother for being my loving partner on this journey of parenthood."
"There's so much that goes on,” she told E! News in May. “Your hormones, everything's going crazy—people say that if you can make it through the first year together, that's the biggest milestone. Being in a relationship while having a kid, there's a level of depth and intimacy and trust that you have to go to with someone."
She also knows that caring for a little one often takes a village.
"This has been such an experience from the moment I got pregnant til now," Rumer explained to E! in November. "It's been such an exercise in surrender and self-trust. Everyone will give you advice—grandparents, friends, sisters, doctors—and the truth is you really have to trust yourself."
"We're in such a different time, there's just so much more information," she explained. "My mom will be like, 'You should do this with her,' and I'll say, 'Actually, based on what I've been reading, you don't do that anymore.'"
"I think as parents you want to give your kids whatever you didn't have,” she continued. “But the beauty in what I'm learning is, she might not need what I didn't get, because she's her own person."
Keep reading to see who other celebs who called it quits this year.
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Joey Lawrence & Samantha Cope
Jennifer Lopez & Ben Affleck
Tommy Fury & Molly-Mae Hague
Lauryn "Pumpkin" Efird & Josh Efird
Christina Haack & Josh Hall
Cameron Mathison & Vanessa Mathison
Deon Derrico & Karen Derrico
Tianna Robillard & Cody Ford
Charles Spencer & Karen Spencer
Carly Lawrence & Bennett Sipes
Joe Jonas & Stormi Bree
Harry Styles & Taylor Russell
Firerose & Billy Ray Cyrus
Dorit & PK Kemsley
Gerry Turner & Theresa Nist
Natalie Portman & Bejamin Millepied
Tori Spelling & Dean McDermott
Chelsea Lazkani & Jeff Lazkani
Gypsey Rose Blanchard & Ryan Anderson
Jax Taylor & Brittany Cartwright
Porsha Williams & Simon Guobadia
Robert Irwin & Rorie Buckey
Jason Isbell & Amanda Shires
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The Daily Crossword was played 10,288 times last week. Can you solve it faster than others?The Daily Crossword was played 10,288 times last week. Can you solve it faster than others?