The couple, who wed in 2012, welcomed their daughter, Betty, in October 2019. The longtime couple are also parents to six-year-old daughter James, and four-year-old daughter Inez.
Before signing off, Blake tagged Megababe founder Katie Sturino, who has called out brands for their lack of inclusive sizing in the past.
"@katiesturino and others are out there challenging brands to do better, helping women to not feel alone," Lively added, "And she's making meaningful progress. She reminds me, we all can ask for better from the brands we love."
The day prior the 33-year-old actress posted a throwback to her post-pregnancy fashion.
Taking to her Instagram Stories from just months after welcoming daughter Betty, Lively was wearing a blue floral print dress under a cobalt Max Mara teddy coat for an appearance on Good Morning America.
"One year ago today," she wrote. "Just had a baby. Hadn't slept in forever. But earring game was single and ready to mingle."
She tagged jewellery designer, Lorraine Schwartz, writing, "I'm coming back as your collection in my next life."
If Lively's throwbacks weren't enough to prove just how much we love this Hollywood family, Reynolds recently opened up about why he believes his wife and daughters are real-life "superheroes".
While promoting his new film The Croods: A New Age, the actor caught up with Mario Lopez's children for Access Hollywood, sharing: “I come from all boys. I have three older brothers. I’m the youngest of four boys so for me to have three daughters has been such a ride. I love every second of it.”
And when asked if the women in his real-life family are “superheroes” like in his movie, Reynolds couldn't help but gush about his wife and daughters.
“No joke, they are the most capable people I know," he said. "If anything got crazy or scary in my life, they are the first people I would lean on because they have wisdom and strength and they’re calm under fire. They have courage under fire. That, to me sounds like a true story."