Khloe Kardashian Lamar Odom
Khloe Kardashian and Lamar Odom Reuters

Lamar Odom is reportedly upset that his estranged wife Khloe Kardashian is planning for a baby with her alleged new boyfriend, French Montana.

"Lamar will be devastated and betrayed if she and French have a baby," a source close to the former NBA player told In Touch, via Hollywood Life.

"If Khloe suddenly announces she's pregnant, it could also send him into another downward spiral," the insider continued. "It would really hurt Lamar."

The 29-year-old Keeping Up With The Kardashians star and the rapper have been spotted together frequently in the recent weeks and they are reportedly getting serious with their relationship.

"She hasn't felt this happy in a long time," a source close to the two told Life & Style magazine, via Hollywood Life. "Friends keep telling her she deserves this, finally."

According to the magazine's source, "She doesn't necessarily believe in being married to have a baby. Look at [her sisters] Kourtney and Kim!"

Khloe's efforts to get pregnant have been well documented in the media and it is no secret that she visited fertility specialists for IVF treatments. It was also featured on the family's reality show.

However, Kim Kardashian appeared on Jimmy Kimmel Live and said that Khloe started skipping doctor's appointments when she realised her marriage was falling apart.

In the April 2014 issue of Cosmopolitan, Kardashian had opened up about having children.

"I love kids," she said. "I hope and pray I have kids when the time is right."

Meanwhile, French Montana is still legally bound to estranged wife Deen Kharbouch, with whom he has a four-year-old son, Kruz.