Khloe Kardashian Is 'Beside Herself,' On Way to Las Vegas With Kim to Be by Lamar Odom's Bedside

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In the wake of Lamar Odom's hospitalization, the former Los Angeles Lakers star's ex Khloe Kardashian is on her way to Las Vegas to be by his side.

A source close to the Kardashian family tells ET that Khloe and her sister Kim, along with a third family member, are en route to Sunrise Hospital in Las Vegas to be with Lamar, who was hospitalized after he was found unconscious on Tuesday afternoon at the Love Ranch brothel in Crystal, Nevada.

WATCH: Lamar Odom Found Unconscious in Nevada Brothel, Transported to Las Vegas Hospital

According to the source, Khloe is "beside herself" over Lamar's hospitalization.

The 35-year-old former NBA player was discovered unresponsive by employees of the Love Ranch on Tuesday after spending several days at the establishment.

Brothel owner Dennis Hof told ET that Lamar arrived Saturday night and was "in a great mood." However, Hof claims his spirits seemed to dip on Sunday and that Lamar "seemed upset [and] a little somber."

NEWS: Khloe Kardashian Admits She Regularly Checks Up on Ex Lamar Odom

TMZ reports that Odom required intubation when he was admitted to the hospital, a procedure often performed by doctors to maintain an open airway into the lungs when a patient cannot breathe on their own.

On Tuesday evening, around the time news of Lamar’s hospitalization broke, Khloe's half-sister Kylie Jenner abruptly ended a livestream on her new app.

WATCH: Lamar Odom Was in a 'Great Mood' Days Before He Was Found Unconscious, Says Brothel Owner

"Had to end my live stream," Kylie tweeted, without revealing why. "I love you guys."

Check out the video below for more information on Lamar's hospitalization on Tuesday.