Bam Margera 911 Call 'Possible Overdose'

7/20/2009 10:50 AM PDT

TMZ has learned "Jackass" star Bam Margera was rushed to the hospital yesterday after paramedics responded to a 911 call for a "possible overdose."

We're told state troopers and medical personnel arrived to his home in West Chester, Pennsylvania at around 1:30 PM.

Story developing...