Ashlee filed for divorce in L.A. County Superior Court, citing "irreconcilable differences" as the reason for the split.
According to TMZ, she's asking for joint legal custody and primary physical custody of two-year-old Bronx.
And she means business! She hired power attorney Laura Wasser, and is also asking for spousal and child support.
Forget about this being a smooth split, apparently there's no prenup!