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PHOTOS: Khloe Kardashian and other stunning celeb makeovers

Added brother Rob, "She's not pregnant. I live with those two, and I would know if she was pregnant."'

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PHOTOS: More stars who deny they're pregnant

Khloe Kardashian Odom is putting those pregnancy rumors to rest.

But at Thursday's Lakers game, her mother Kris Jenner told UsMagazine.com: "If Khloe is pregnant, I would be the first to yell it. So, no,Rock Republic, she's not -- unless they're holding out on me, in which case they're both grounded."

Earlier this week, RadarOnline reported that the E! reality star, 25, is two months pregnant with husband Lamar Odom's baby.

"We're just being a healthy married young couple," said Khloe, who will celebrate her one-year wedding anniversary in September. "I'm not sitting here staring at an ovulation calendar. I'm not saying to Lamar, 'Okay, it's time, let's go!'"

But mom Jenner told Us when the time comes, "she'll be the best mom in the world. She helped me raise Kendall and Kylie. I couldn't have done it without her. And [Lamar] will be a great dad. He's got two beautiful children. I can't wait until the rest of my kids have kids of their own, but right now we have little Mason, and I'm very,Prada, very happy."

In February, Khloe admitted to Steppin' Out magazine that while she was "not on the pill," she wasn't in any rush to become a mom.

Asked at the Lakers/Celtics game Thursday if she's expecting, she told Entertainment Tonight: "No, I'm just fat."

PHOTOS: Khloe and Lamar's dreamy wedding

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