The 32-year-old Clippers basketball player - who has been married to the 'Keeping Up With The Kardashians' star for three years - is reportedly upset that he cannot support his nervous 28-year-old wife during her first time co-hosting the popular reality series live alongside Mario Lopez tonight (31.10.12) because he has a game at the Staples Centre in Los Angeles.
A source told HollywoodLife.com: ''[Lamar] can't be in two places at one time. Of course he wants to be there with Khloe supporting her on 'X Factor', but he's got a game today and his teammates are counting on him, so that's where he has to be. That's his job and he has priorities, just like she does. He knows that and Khloe knows that too, so they're both good with it.
''Khloe wishes him well, and she wants him to come off the bench and score some points, and help bring the championship back to the Clippers. They support each other on everything. It's a busy day for them. They've got so much s**t going on today, but they are both happy and excited for each other. It's all love, and it's all good.''
Earlier today, Khloe admitted she is extremely nervous ahead of her first live presenting gig and told her fans on twitter that she intends to rush over to the Staples Centre to watch Lamar's game right after the show ends.
She wrote: ''Today is a crazy day... My first X Factor live show!!! Ahhhhhh and then ill rush downtown for the Clippers game opener. ... Seriously I have the best FRIENDS on twitter!! Thank goodness 4social media! When I'm nervous I get lifted up! I love you guys!!!! Thank YOU (sic).''
Khloe's co-host Mario recently revealed he thinks they have great chemistry and is looking forward to working with her on the show.
He said: ''It's been great since you can't manufacture chemistry. You either have it or you don't. It makes it easy and comfortable.
''I think I'm pretty hyper and like to talk. Our personalities mesh well and compliment each other.''