BEYONCE'S MOM FILES FOR DIVORCE!

Beyonce Knowles' mom -- the original costume designer for Destiny's Child -- has filed for divorce from her husband Mathew Knowles.
Tina Knowles filed divorce papers in Harris County, Texas last month, in an attempt to end their 29-year marriage.

Back in October, Mathew was hit with a paternity lawsuit from a woman who's not his wife -- no word if that affected Tina's decision to pull the plug.

Mathew has been Beyonce's manager for years, so there could be a ton of cash up for grabs in the split.

The couple has two children together: Beyonce and Beyonce's younger sister.