Amanda Bynes was arrested after she threw a bong used to smoke marijuana from the window of her 34th-floor apartment in New York, police said.
Bynes faces a felony count of tampering with evidence and charges of reckless endangerment and marijuana possession.
She was taken to Roosevelt Hospital for psychiatric observation before she was booked at the Midtown North Precinct house, the newspaper reported.
No injuries were reported in the incident.
Bynes is the former star of TV's "The Amanda Show" and "What I Like About You" and the films "What a Girl Wants" and "Hairspray."
Her once-bright career has been eclipsed in recent months by reports of erratic behavior, bizarre online rants and motor vehicle offenses.