The 'Indiana Jones' star – who began dating the 'Ally McBeal' actress in 2002 – is full of admiration for the way in which Calista raises her seven-year-old adopted son Liam.
He said: "She's the best mom in the world. She's a mother by choice – she adopted Liam before we met, as a single parent, which is an awesome responsibility to take. She's devoted herself to Liam and has done a really wonderful job raising him. I'm happy to now have a part of the job."
Harrison, 65, says he gets great joy from being around Liam and enjoys playing the role of father again.
The actor – who has four older children from two previous relationships – explained to Reader’s Digest magazine: "She's brought a child back into my home. My youngest, other than Liam, is 17. It's a wonderful opportunity to be part of a child's upbringing, which is always an endless springtime. You see the blossoming and the growing and the nurturing and the payoff."
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