This past Monday was the Los Angeles Premier of “Transformers: Revenge of the Fallen” and after following Megan Fox’s recent hits (Japan Premier) and misses (quasi mullet fiasco) on the red carpet, I was excited to see what she had in store for the big event. To my dismay (though I'm sure only mine due to the fact that I was surrounded by techy 13 year old boys who couldn't have cared less about Megan's hair) she had some frizzy half-up hairdo with a barely-there headband that created a weird ripple effect near her forehead. While the look was more unfortunate than terrible and totally forgivable, her co-star Isabel Lucas' two-tone-too-much-root hairdo was the biggest disaster of the carpet. Lucas is new to the movie star scene but she should know that dark brown roots and blonde curls don't go well together, even though some veterans of the carpet have made the same mistake. Check out other hair-dye mishaps.

The Transformers premier did have a couple saving graces though, Kristin Cavallari looked smokin' with a simple bun.

Copy this and other other celebrity updos, perfect for summer and apparently perfect for summer Blockbusters.