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Kimberly Williams-Paisley is remembering her Father of the Bride costar Diane Keaton, who died at age 79 on Oct. 11

She tells PEOPLE that working with the actress was "one of the highlights of my life"

Williams-Paisley recalls a screen test with Keaton for Father of the Bride, and says she heard her laughter before meeting her

Kimberly Williams-Paisley is mourning the loss of her costar — and on-screen mom — Diane Keaton .

Keaton died at age 79 in California on Saturday, Oct. 11. In an exclusive interview with PEOPLE, Williams-Paisley, who played Keaton's daughter in the Father of the Bride films, shared touching memories of the star — including her infectious laughter.

"It's really one of the best memories I'll ever have in my life, getting to work with Diane

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