“I don’t want summer to end! This has been a summer of wonderful Florida memories!!! #littlecouple #summertime #proudmom,” the reality star captioned the sweet snapshot with son Will, 4, and daughter Zoey, 3.
The neonatologist and husband Bill Klein live with skeletal dysplasia – a condition that the couple and both of their children share.
“From when I was a kid, I knew I was going to be an adoptive mom,” Arnold told PEOPLE. “I dreamed of being a mother. Like everything else in life, I am going to try everything I can to achieve my goals. Now, that I am a mom, it’s awesome.”
The couple adopted Will from China and Zoey from India.