- Breakthrough role was in 1976 as the title child gangster in Bugsy Malone, opposite Jodie Foster.
- Was introduced in season 5 of Happy Days as Fonzie's cousin Chachi; when his spin-off, Joanie Loves Chachi, was cancelled after one season, he returned for the last season of Happy Days.
- Named one of TV Land's Top Ten Sexiest Men in 2005.
- Named No. 18 on VH1's compilation of 100 Greatest Teen Stars.
- Wife Renee Sloan was a body double for Pamela Anderson, Baio's former girlfriend, on Baywatch.
- Mario Baio — Father
- Steven Baio — Brother
- Renee Baio — Wife
- Jimmy Baio — Cousin
- Joey Baio — Cousin
- Pamela Anderson — Ex-fiancée
- Bailey DeLuca Baio — Daughter
- Stephanie Baio — Sister
- Erin Moran — Ex-significant Other
- Rose Baio — Mother
- Heather Locklear — Ex-significant Other
- Kalyn Sloan — Stepdaughter
- Renee Sloan — Wife
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