Katherine Kelly Lang Divorce -- 'Bold and the Beautiful' Star Splits from Hubby

This isn't a soap opera storyline ... "The Bold and the Beautiful" star Katherine Kelly Lang has filed for divorce from her hubby ... TMZ has learned.

According to the divorce papers filed earlier this month, Lang cites irreconcilable differences for the split with hubby Alex D'Andrea. She is asking the judge to block his right to be awarded spousal support.

Lang and D'Andrea had been married since 1997. The couple has a 15-year-old daughter together.