Eggert tweeted Saturday to ask Baio about what happened in his garage when she was a minor.
Baio responded in a 16-minute Facebook Live video saying that he is being falsely accused of inappropriately touching and having intercourse with her when she was a minor. Baio said he and Eggert had a consensual relationship after she was over the age of 18.
Reps for Baio and Eggert did not immediately respond to request for comment.
"Charles in Charge," which aired from 1984 through 1990, was a sitcom about a college student who worked as a family's live-in housekeeper.
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