EXCLUSIVE: Khloe Kardashian Cancels Press Tour to Remain By Lamar Odom's Side

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Khloe Kardashian has canceled her upcoming press tour to be with Lamar Odom.

A source close to the 31-year-old Keeping Up With The Kardashians star confirms to ET she has canceled her upcoming press tour for her book, Strong Looks Better Naked.

"Khloe hates to cancel or reschedule anything when it comes to work, but right now, her number one priority is getting Lamar back to good health," the source says. "She won’t leave his side and knows that is the most important place she needs to be right now. She is canceling her press commitments for the time being."

WATCH: Khloe Kardashian's New Book Sheds More Light on Lamar Odom's Drug-Addled Past

Lamar remains hospitalized at Cedars-Sinai in Los Angles after being found unconscious at the Love Ranch Brothel in Crystal, Nevada. A source close to Lamar tells ET that doctors are waiting for test results come to back to see if he needs a kidney transplant. The former basketball player reportedly had two medical procedures done last night.

The upcoming book, which was printed before Lamar's hospitalization and is due out Nov. 3, details Khloe's marriage with Lamar and does not hold back about the basketball star's alleged drug abuse.

"The thing is, you can't control other people, and you can't control the outcome of situations," Khloe writes in the book, "and if you think you can, you will soon discover that you are sadly mistaken."

WATCH: 'Keeping Up With the Kardashians' Producers in 'Early Stages' of Figuring Out Lamar Odom Storyline as Filming Resumes

Lamar came out of his coma last Friday while in the ICU at Sunrise Hospital in Las Vegas. After showing improvement, he was transported by to L.A. Khloe has been by his side nearly every step of the way. And on Wednesday, the reality star's lawyer, Laura Wasser, filed to have the couple's divorce papers withdrawn.

Watch below for more updates on Lamar's recovery.