The 55-year-old actor told 'Access Hollywood': "[Ireland's] mother is obviously one of the most beautiful women that [has] ever lived -- and even divorce doesn't muddy my view of that. Kim is one of the most beautiful women that ever lived and even Ireland sees that.
"The good news is my daughter is someone who somewhat understands . . . It's hard at that age to have that wisdom that beauty comes and goes."
Alec, who bitterly divorced Kim in 2002, can't wait for his yoga instructor wife to give birth and admits he never expected to have the kind of family he has now.
He said: "I never imagined I would be sitting at a table with my wife having a baby and I have a daughter that's almost 18 years old. It's bizarre."