The estranged couple were both spotted out and about in the posh California town - as Arnold took a midday cruise on his motorcycle while Maria did some shopping with their son Christopher (sans her wedding ring).
Earlier in the day, the 55-year-old mother of four took to her Twitter to show her appreciation for veterans and their families on this commemorative moment, writing, "This weekend, I'm thinking of all who gave their life, and all the families who lost a loved one, in service to this great country. You have our deepest gratitude and respect. God bless."
Shiver added, "My daughter once gave me a great Plato quote that said, 'Be kind, for everyone you meet is fighting a hard battle.' I love that. So true. We don't know what is going on inside of most people. On this Memorial Day, when so many are grieving in obscurity or silence, let's keep that in mind."