The former Golden Girls star is paying a visit to Hewitt's racy Lifetime show, The Client List.
In the show's season finale, Riley, played by Hewitt, will be left in charge of the spa when her boss goes on vacation.
White, 90, will play Ruth Gibbons, the wife of one of Riley's clients who has some advice to offer about making a marriage last.
Hewitt will direct the episode, which will air June 10 (10 p.m. ET).
Read more at PEOPLE.
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