- Chosen as one of Teen People Magazine's "21 Hottest Stars Under 21." 
- Loves reading in her spare time.
- Legally emancipated from her parents at the age of 15.
- Attended Santa Fe Christian High School.
- Wrote a script called "Don't Blink" which was sold, but never made.
- Collects rare books. Owns a first edition of The Great Gatsby amongst others.
- Dated Conor Oberst. Some songs for his band Bright Eyes are about her.
- Was on Entertainment Weekly's annual It List (2000)
- Graduated from high school when she was 15.
- At 16 won the Robbins Trading Company World Cup Championship of Futures Trading by turning $10,000 into $100,000. It is the second highest profit in the tournaments history.
- Dated singer/songwriter Andy Herod (of "The Comas") for two years. His latest album "Conductor" is about their relationship and his heartbreak after it ended. Michelle also features in the accompanying short film of the same name.
- Was roommates with Christina Ricci whilst filming Prozac Nation (2001) with her.
- Has one younger sister Paige and three older half siblings from her father's first marriage - Jason, Kelley and Sara.
- Her father Larry is a Commodities Trader and is divorced from her mother Carla.
- Was one of ELLEgirl's 25 Favourite Hot, Young, Talented New Stars (2003)
- Shares a birthday with actors Adam Sandler and Hugh Grant.
- Michelle and her fiancé, Heath Ledger, had a girl, Matilda Rose, on October 28, 2005 in Brooklyn, New York.
- The godfather of her daughter Matilda is Jake Gyllenhaal.
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