Life & Style can exclusively reveal that Kim Kardashian is single once more! Since her breakup with longtime boyfriend Reggie Bush, Dallas Cowboys wide receiver Miles Austin has been her first and only public boyfriend. Now, multiple sources confirm to Life & Style that their once steamy relationship is fizzling away. "The two are casual at best," an insider tells Life & Style. "Kim knows she needs time to date and take it really slowly after her breakup with Reggie."

Kim confirms she's single, telling Life & Style that viewers will get to see her single life play out on the new season of Keeping up with the Kardashians. "I think this is the first time I've ever really been single filming the show," Kim tells Life & Style. "You'll see me single and having a good time."

Certainly, Kim has no shortage of men vying for her attention. In fact, the reality star couldn't resist an invite to lunch with old flame Portuguese soccer player Cristiano Rinaldo and his hunky friends, at the Polo Lounge restaurant at the Beverly Hills Hotel on August 3. An insider says she spent most of the meal flirting with the international soccer stud.

And while Kim says "it's been a lot of fun" being single, the driven star is putting her career first. "I'm a workaholic, so I'm trying to dive into work and make it all about me and try ing to focus on everything that I want to accomplish now," Kim tells Life & Style. "I'm all by myself, so I can do it all!"

For more on Kim, pick up this week's issue of Life & Style, on newsstands now!