pregnant blonde Mike Comrie Hilary Duff sister dog Lola Haylie

Hilary Duff may look cool, but underneath it all she's HOT!

The California girl took to Twitter to complain about rising temperatures in LA on Twitter Friday, writing: "Holy heat! This 105 degree weather is killin' me! Anyone in Cali feeling this?"

Then the pregnant cutie admitted she cheated on her diet: "Just got out of an hour spin class and then proceeded to eat 1 1/2 cookies! I'm pretty sure that defeats the purpose!! Crap! ;)"

Well we're pretty sure that extra cookie and a half won't make too big a difference. Hil's been hitting the gym every day since she announced her pregnancy so she's certainly on track for a healthy 6 more months!