EXCLUSIVE

Ralphie May might be adding some new edgy relationship jokes to his routine -- his wife is pulling the plug on their marriage.

Lahna Turner filed divorce docs in L.A., citing irreconcilable differences. She and Ralphie have an 8-year-old daughter and 6-year-old son together -- and she's asking for sole physical and joint legal custody.

Ralphie got his big break as runner-up on the first season of "Last Comic Standing." Lahna also does standup comedy.