Alicia Silverstone has officially pulled the plug on her marriage to Chris Jarecki ... she's filed for divorce.
The actress filed docs Friday and just a few days shy of the 3-month mark from when she announced her separation from her husband of 13 years.
According to the docs -- obtained by TMZ -- Silverstone lists their date of separation for March 15, 2016. She cites irreconcilable differences as the reason for the split and notes a prenup will decide how they'll split their assets.
The docs ask for joint physical and legal custody for their 7-year-old son Bear Blu.
At the time of their split, a rep for Alicia said, "They still deeply love and respect each other and remain very close friends but h ave mutually decided to separate after being together for 20 years."
Alicia and Chris dated for 8 years before tying the knot in 2005.