Celebrity Parents Rob Kardashian 'So Thankful' for Blac Chyna on Mother's Day: 'Never Thought I Could Be This Happy' Rob Kardashian took to Instagram to celebrate his ex-fiancée and their 6-month-old daughter Dream By Aurelie Corinthios Published on May 15, 2017 09:12 AM Share Tweet Pin Email The engagement may be off, but Rob Kardashian still has plenty of love for Blac Chyna. The Keeping Up with the Kardashians star took to Instagram on Sunday to wish his ex-fiancée a happy Mother’s Day with a sweet video compilation of clips of Chyna, 29, chronicling her pregnancy with their daughter Dream Renée, now 6 months, as well as a few adorable moments with Chyna’s 4-year-old son King Cairo, whom she shares with her ex Tyga. “And happy mama’s day to the mother of my only child @blacchyna,” Rob, 30, captioned the post. “I am so Thankful for our beautiful baby girl and so Thankful for YOU and never thought I could be this Happy so thank you for giving me Her.” Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Babies newsletter. https://www.instagram.com/p/BUGIrONhgoh/?taken-by=robkardashian&hl=en Rob and Chyna appeared to spend Mother’s Day apart. Rob spent the day with his mother and sisters, accompanied by daughter Dream, while Chyna spent the day with King, though she was reunited with Dream later in the day. On Sunday, Rob also took to Instagram to honor his mom Kris Jenner, 61, sharing a photo of the two of them. “Happy Mama’s Day to all the Beautiful Mothers out there ! I Love You mama @krisjenner.” https://www.instagram.com/p/BUFztdZhq-V/?taken-by=robkardashian&hl=en Rob’s sisters Kim, Khloé, Kourtney and Kylie also took to social media to celebrate the holiday and share sweet tributes to their momager. “HAPPY MOTHER’S DAY to my beautiful mommy who still teaches me how to celebrate life and make the best out of every experience and truly live in the moment!” gushed Kourtney, 38. “I love you mommy and hope you know how much you are loved by your six children and six grandchildren every day.” “Happy Mother’s Day to the Queen! The boss! The legend that is…. Kris Jenner,” wrote Khloé, 32. “I saved the Queen for last! Mom you have walked through the fire for us all and I know in my heart you would do it all over again to keep us safe,” wrote Kim, 36. “We’ve all been through so much together & you are always our strength when we need it. I love you so much!” Keeping Up with the Kardashians airs Sundays (9 p.m. ET) on E!