Paternity Shocker! Khloe's Boyfriend Reveals Truth About His Pregnant Ex's Baby

Keeping up with the Kardashians reality star, Khloe Kardashian, doesn't have the best luck when it comes to basketball baller boyfriends and babies!

It's only been one month since Kardashian, 31, started dating NBA star, Tristan Thompson, and already there is some major drama — Thompson's ex-girlfriend, Jordan Craig, is pregnant with a baby boy!

But is Thompson the father of Craig's unborn son?

"Tristan told Khloe that it is not his child," a source close to the Keeping up with the Kardashians clan told RadarOnline.com exclusively.

"She wants to believe him, of course," said source. "But she is obviously very skeptical about the whole situation."

However, according to the insider, Kardashian's meddling momager, Kris Jenner, 60, "doesn't buy it for a second!"

"Kris tried to get to the bottom of this by contacting Jordy. She just wanted to get some answers," the source told RadarOnline.com, adding, "But when Khloe found out what Kris did she flipped and told her to stay out of it."

As KUWTK fans know, Kardashian is extra sensitive to infidelity following her marriage to Lamar Odom.

"Khloe told her sisters that she would never want to be a homewrecker because she knows how it feels to be cheated on," the source told RadarOnline.com.

"She doesn't want any woman to have to go through what she went through with Lamar."

Do you think that Tristan Thompson is the father of Jordan Craig's baby? Tell us your thoughts below.