Katherine Heigl’s mom ruining her marriage?

Katherine Heigl’s marriage is on the rocks — and it’s all because of her mother. Sources say Heigl’s husband, musician Josh Kelley, is furious that Katherine’s mom Nancy Heigl spends so much time at their L.A. home.

“Josh is a patient guy, but he’s fed up playing second fiddle to his mother-in-law,” an insider said.

“Nancy lives around the corner from Katherine and Josh in her own place, but she spends so much time at their home that she may as well move in.

“She often stays overnight and knocks on their door pretty much every day she’s in town.

“Josh told Katherine that they need more quality time together – without her mother,” the insider divulged.

“He demanded Katherine spend more time with him and less with Nancy – period. He loves his mother-in-law, but this is a real problem for him and it’s becoming a major issue in their marriage.”