Bombshell Confession! Khloe Kardashian Told Lamar Odom Robert Kardashian Is Not Her Father, Insider Says

Khloe Kardashian confessed to Lamar Odom that she knew Robert Kardashian wasn't her real father, a source told RadarOnline.com exclusively.

The truth about Khloe's paternity has been a long running storyline on Keeping Up With the Kardashians, with the 30-year-old reality star insisting that the late attorney was indeed her father, but a source told RadarOnline.com that she isn't being truthful.

"Khloe told Lamar that she knew that she didn't have the same dad as her sisters" Kim and Kourtney Kardashian, the source said.

O.J. Simpson's good friend Thomas Scotto has said that Simpson could definitely be Khloe's father, while many critics have pointed out that she doesn't resemble Kim or Kourtney at all.

But the truth may finally come out: According to an Australian magazine, Khloe comes face-to-face with her father in the final episode of season 10 of Keeping Up with the Kardashians.

Who do you believe is Khloe's real father? Sound off in comments below and check out what the Kardashians are saying on Twitter right now.