Jessica Simpson's boyfriend Tony Romo has reportedly issued the hard-partying star with an ultimatum – cut back on the booze or it's over.

According to sources, the singer hit the bottle in a big way after her stint supporting Rascal Flatts on tour came to an end in March.

And her quarterback beau is apparently not impressed.

“Tony is fed up,” the insider told The Enquirer. “She’s been pressuring him to marry her and have children, but he’s giving her a firm ‘no’ until she cleans up her act.”

Tony has warned he "won’t even consider moving forward with Jess until she cuts back on partying,” adds the source.