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Kim Kardashian, who showed off her curves in a body-hugging white YSL dress and Tom Ford heels Thursday in Mexico City at Cosmopolitan mag's 40th Anniversary celebration, wrote on her blog, "Yes, I have gained some weight ... but I guess being happy and comfortable does that to you."

(Life & Styleclaims she has gained "15 to 20" pounds since she began dating KanyeWest in April.) So she's getting back on the diet program she endorsesto help shed pounds.

Blogged Kim on Thursday, "I am back in thegym, watching what I eat and that combined with starting QuickTrim againmeans I'm feeling positive. I just want to be at my target weight andfeel good about myself. I hate feeling heavy and lazy and it's not anice feeling when my clothes don't fit. Just gotta stay focused! Xo"

Her slimming plans seem to be working already. On Wednesday, she tweeted:"Since I started QuickTrim again a few weeks ago, I'm down 6 lbs!!! Yaybest feeling. I was getting discouraged but now I'm so motivated!"