The actors, who play brother and sister on the hit drama, eloped at the end of 2008 - a year before Hall was diagnosed with Hodgkin's lymphoma - and Carpenter admits the battle that followed made both stars realise what marriage truly means.
She tells TV Guide magazine, "To have life come at you in such a big way, from the second Michael was diagnosed until we finally heard the doctors say he's going to be OK, was beyond anything I've ever experienced. But it became an opportunity to grow and really appreciate each other.
"In a strange way, his illness was the best thing that ever happened to us - and Michael's hair is more gorgeous now than it's ever been."
Hall lost his hair while battling lymphoma and took to wearing a cap to cover his head.