Kimora Lee Simmons is going through her second divorce … because her estranged husband just filed to officially pull the plug on their marriage.

Tim Leissner, an ex-Goldman Sachs banker, beelined it to court in February and filed to divorce Kimora after almost 12 years of marriage … according to legal docs obtained by TMZ.

In the docs, Tim goes with the boilerplate “irreconcilable differences” as the reason for the split.

Tim does not list a date of separation … the docs say TBD … but we know they have been estranged since at least March 2022.

A source familiar with the situation tells us they’ve been going through this process for at least 6 years and this is just a matter of housekeeping.

Kimora and Tim have one child together … 11-year-old Wolfe Lee Leissner.

Tim is asking for joint legal and physical custody of their kid … plus spousal support.