heather-locklear-hospitaliz.jpgHeather Locklear was taken to the hospital this afternoon after her sister called 911 with a "medical emergency."

The fire department and the Ventura County Sheriff's Department responded, and Locklear was whisked away in an ambulance shortly afterwards, according to TMZ.

The person who made the call was worried about Heathers state of mind and they were afraid she was going to harm herself, a source told Radar. Locklear recently called off her engagement to Jack Wagner, and the source added, She is distraught over her relationship with Jack, it is on and off and it has upset her lately."

Back in 2008, Locklear's doctor called 911, expressing concern that she may have overdosed on prescription medicine in an alleged "suicide attempt."