Kim Kardashian shows off her slimmer physique. (Photo : Twitter: @KimKardashian)

Kim Kardashian's workouts are finally paying off. The 31-year-old reality star flaunted her slimmer physique in a Twitter photo of her wearing a tight, short and backless sequin dress from her Kardashian Kollection.  Although she is getting her usual praises from her fans, the Kardashian who is really getting the fashion spotlight is Kim's little sister Khloe Kardashian-Odom.

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Khloe stunned in a sexy lace strapless from the Kardashian Kollection. The sisters, including Kourtney, were doing a photoshoot for U.K. women's store Dorothy Perkins. Khloe is currently in Miami visiting her sisters while they film the E! network series "Kourtney and Kim Take Miami."

Khloe didn't just steal the spotlight with her style; she is also getting a lot of buzz for her latest gig as an X-Factor host.  The reality star is set to host alongside Mario Lopez for the new season of "The X-Factor."  This would be the biggest milestone for a Kardashian since the family snagged an interview with Oprah Winfrey over the summer. 

Older sister Kim is notoriously obsessed with fame and has gone to great lengths of getting it.  HollywoodLife reports that a source close to the Kardashian clan is saying that Kim is jealous of Khloe's new venture. According to the source, Kim fears that "The X-Factor" will make Khloe the more famous Kardashian.

The source says: "Kim is worried that Khloe is going to become more famous than her because of her X Factor gig. She has been snappy lately and saying things to Khloe like, 'I should be a co-host with you', or the other extreme, 'The X Factor job is going to be totally stressful, are you sure you are up for this type of thing?' [...]  Khloe wishes Kim would just be happy for her but there has always been some sort of competition between the girls."

Khloe fuels the rumor with her latest tweets:

"Just one of those days..."

"Practice what you preach!"

"Stop telling others how to be... Focus on you and your own. Looks like the focus needs to be on yourself. We can always get better"

The source says, "Kim's biggest fear is that she will become irrelevant like Paris Hilton!" and adds, "Kourtney on the other hand is beyond thrilled for Khloe."

Once Khloe Kardashian makes her hosting debut, she will be watched by millions of viewers. This hosting gig can lead her into a slew of other great opportunities. Kim has tried to be the one to separate herself from her sisters by doing solo magazine covers and interviews but it seems like Khloe is the one branching out - in a grand way at that!

Do you believe Kim Kardashian is jealous of Khloe?   

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