According to court docs, which Tia filed today -- in person -- at L.A. County Superior Court, Tia has cited irreconcilable differences with her husband, photo journalist Simon Wakelin.
The couple has a 4-year-old daughter together.
According to the docs, the 43-year-old "Wayne's World" star is asking for sole physical custody of the child.
Tia has experience with the divorce process -- she split from her first husband, Elie Samaha back in 2000.
Story developing ...