- On September 21, 2006, Katie gave birth to her first child, a son named Riley John Wagner-Lewis.
- Her first crib was a gift from Katharine Hepburn and Spencer Tracy.
- Maternal half-sister of Joshua Donen and Peter Donen.
- Her close friends include Melissa Gilbert and Julian Lennon.
- Her son is named after her father, actor Robert Wagner.
- Stepdaughter of Jill St. John.
- Was a reporter for Movietime (1987-1990), the precursor to E! Movietime became E! in 1990.
- Paternal half-sister of Courtney Wagner.
- Named for Katharine Hepburn.
- Was maid of honor at her father's wedding to Jill St. John.
- When she was born, Fred Astaire bought her a bracelet that said, "Katharine, I love you. F.A". Katie no longer has the bracelet.
- Stepsister of Natasha Gregson Wagner.
- She still works for TV Guide Channel, although, you don't see her on camera much anymore. (August 2004)
- Daughter of Robert Wagner and Marion Marshall.
- Is the hostess for TV Guide Channel's 'Music News' segment. (August 2002)
- At one point in her life, she was the stepdaughter of Natalie Wood.
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