A newbie to social media site Twitter, Rosie announced she'd never heard of recent Grammy winner Arcade Fire. "And then the Arcade Fire fans went insane! [Fans tweeted] 'Who do you think you are? You're fat! You're old! You're irrelevant!'"
O'Donnell went on to say she was excited about her future talk show and how the meeting with the big boss took place at her home. "So we start cleaning the house. My daughter Vivienne, she said [to Oprah], 'I just wanted to tell you... our house is never this fancy.'"
Rosie, a mother of four, said her own mother passed away in 1973, and admits she knows very little about her side of the family. Rosie appeared on "Who Do You Think You Are" and traveled to Ireland to discover details of her lineage. She said her family went through "a lot of suffering."
Find out the other secrets Rosie encountered on "WDYTYA," airing Friday on NBC.