11/30/2012 at 09:00 AM EST
Mayim Bialik, who announced her split
with husband Michael Stone last week after nine years of marriage, has filed for divorce and seeks joint legal and physical custody of their two children.
Court documents filed in Los Angeles on Dec. 21 do not list a date of separation for the couple, who are parents to sons Miles, 7, and Fred, 4
Bialik, 36, who stars on The Big Bang Theory
cited "irreconcilable differences" in announcing their split in a statement posted on her Kveller.com parenting blog
"Divorce is terribly sad, painful and incomprehensible for children," she wrote. "It is not something we have decided lightly."
The former Blossom
star penned a book
on attachment parenting, released in September, titled Beyond the Sling.
The couple wed in August 2003 in Pasadena, Calif.