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It's official -- Jessica Simpson's mother Tina has filed for divorce from her husband Joe. 

The divorce filing -- dated September 24 in McLennan County, Texas -- was confirmed in court papers obtained Wednesday by ET. 

RELATED: Joe Simpson Pleads Not Guilty to DUI Charges

The parents of the singer-actress have been married for 34 years.

"It is an amicable split and there is no third party involved," a rep for the family tells ETonline. "Any other related allegations are completely false. The family appreciates your respect for their privacy at this time."

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Last month, Joe Simpson pleaded not guilty to DUI charges after being arrested in Los Angeles on August 4 on suspicion of driving under the influence.