.
The Freaky Friday star said Ruby, 25, and her fiancé are getting married next year in a wedding that the star will officiate.
Ruby, who works as a computer gaming editor, is one of two children adopted by Jamie and Christopher.
The couple are also parents to daughter Annie, 34, who is a dance instructor.
'CONSTANT METAMORPHOSIS'
Jamie said Ruby's transition helped her banish the "old idea" that gender is fixed and embrace the concept that her life is a “constant metamorphosis.”
The A Fish Called Wanda star and director Christopher don't have grandchildren yet, but Jamie admitted she "does hope" they will sometime soon.
Elsewhere in her interview, Jamie opened up about being 22 years sober and said she'd be "dead for sure" if she hadn't curbed her addictions.
JAMIE'S SOBRIETY
Her secret 10-year addiction to the pain medication Vicodin was uncovered in 1998 when a friend watched her wash down five Vicodin pills with wine.
The actress, who previously called herself a "wildly controlled drug addict and alcoholic", said she is now “just a sober person - flawed, contradictory, broken and redeemed”.
Jamie and Christopher tied the knot in 1984 and will celebrate 37 years of marriage this December.
Last year, Jamie commemorated their anniversary with a sweet tribute while sharing a black and white throwback of them holding hands.
"My hand in his. Then and now," she wrote at the time.
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