- Son of actress Shirley Jones and actor Jack Cassidy.
- Signed his first autograph at age 5. The reason? For being Shirley Jones' son.
- His song "Da Do Ron Ron" reached #17 on the German charts in April of 1977. This was the same year David Cassidy's song Gettin' It On The Street reached #12 on the same exact chart. "Da Do Ron Ron" reached #1 on the U.S. Billboard Hot 100, #1 on the Cash Box Top 100, and #1 on RPM Magazine's Canada Top Singles.
- Went to the same High School as Angelina Jolie, Michael Klesic, Nicolas Cage, David Schwimmer, and Lenny Kravitz.
- He and his wife, Tracey Lynne Turner, welcomed the arrivals of first son, Caleb Turner Cassidy, on March 3, 2005 and a second son, Roan Howard Cassidy, on September 23, 2006.
- Was born 1 month after his expected due date.
- Children by ex-wife Ann Pennington: Caitlin Cassidy (Caitlin Ann Cassidy) (b. on 25 November 1981) and John Cassidy (John (Jake) Pennington Cassidy (II)) (b. on 27 February 1985).
- Made his Broadway debut in Willy Russell's Blood Brothers with his half-brother David Cassidy in 1993.
- 3rd child with wife Tracey Lynne Turner Cassidy, a daughter named Lila Tracey Cassidy, was born in December 2008.
- He graduated from Beverly Hills High School in 1976.
- Middle name Paul comes from his maternal grandfather.
- Backed into a vehicle that was stopped at the gate of Warner Bros. Studios, pushing the vehicle into a third vehicle, pinning a security guard between the two vehicles. Cassidy was not cited and the case remains under investigation. (19 February 2004)
- 4th child with wife Tracey Lynne Turner Cassidy, a daughter named Mairin Cassidy, was born in June 2011.
- Won a Dramalogue award for best actor in a stage production of "Diary of a Hunger Strike".
- Stepson of Marty Ingels.
- Daughter, with Susan Diol, Juliet Cassidy (Juliet Jones Diol Cassidy), was born. (March 19, 1998)
- Ex-brother-in-law of Janice Pennington.
- Uncle of Jack Cassidy.
- Former Step-father in-law of David Bortolucci.
- Was considered for the lead role in the cult science fiction flick, Laserblast (1978), but the role went to Kim Milford, instead.
- He and his brothers were delivered via Cesarean section.
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