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Kim and her signature yellow Birkin bag grabbed lunch in LA Tuesday, and we can only wonder what Kim ate since she recently Tweeted that she's going on a "slimdown" for her upcoming wedding!

To that end, Kim got in a workout Tuesday morning before her meal. Between partying and wedding planning lately, the reality starlet is super busy! Over the weekend she attended the 30th birthday bash of Scooter Braun, Justin Bieber's manager, Tweeting him "welcome to the club" (Kim is 30). Adam Levine, Usher, Justin Bieber, Jaden Smith and many more were also gettin' down with Braun at the LA bash.

And on Monday Kim was at Britney Spears' LA concert, along with former friend Paris Hilton and Nicole Richie.