Big Bang Theory actress Kaley Cuoco and Ryan Sweeting are allegedly having an argument over starting a family.

According to Life & Style, the 29-year-old actress, who is best known for her role as Penny in the award-winning comedy, is eager to become a parent, while her Bahamian-born American professional tennis player husband wants to wait a little longer.

"They have been constantly fighting and at each other's throats," a source said. "Kaley really wants a baby right now, but Ryan isn't ready to be a dad."

"He's been pushing it off for a while now. And he recently told Kaley that he's not sure he wants to have kids anytime soon!" the insider added.

Sweeting proposed Cuoco just days after the couple made their major red carpet debut together at the 65th Primetime Emmy Awards. The couple got married on 31 December 2013.

"It's been a rough couple of months," the source went on. "She wants kids soon, so this could be a deal breaker for Kaley. If Ryan doesn't change his mind, they'll probably get divorced."

Cuoco has previously revealed her love for babies.

"I love babies! If you're holding a baby right now, I will take it from you and hold it. Like, I have this need to take it. I don't have my own yet—can't wait—but any child, I just grab," she told E! Online. "I don't take it with me home, but I take it and I hold it for a while. I love it. I love it!"

Despite reports that the couple's marriage is in trouble, Cuoco posted adorable photos of Sweeting on her Instagram account.