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ET spoke to the pair at their son Legendary's first birthday about their relationship and the possibility of having more kids.
'Mission: Impossible -- Dead Reckoning Part One' hits theaters July 12.
Audrey Landers, Charlene Tilton, Joan Van Ark, Linda Gray, Patrick Duffy and Steve Kanaly spoke to ET for the 45th anniversary.
Their friendship goes back nearly a decade.
The country singer revealed her engagement to Arnold in November.