Though Kaley Cuoco may be most famous with long, warm, blond locks, she's rocked more shades and cuts than you might think. In fact, her hair transformation is as varied as Cuoco's stunning style transformation. And we're not just talking a trim and a few highlights every now and then, as "The Flight Attendant" actor isn't afraid to try the unexpected. 

"Just blink and it might be blue or something. I always do something stupid to it. It's hair! It grows back," she told Us Weekly. While playing Penny on the hugely popular CBS sitcom "The Big Bang Theory" from 2007 until 2019, Cuoco explained she liked to alter her look to feel more like herself in between shooting. 

"It's very important for me to change my look after wrapping each season," she wrote in a since-deleted Instagram post. "I love playing Penny, but it's good for me to bring it back to Kaley," she added. And she's also rocked some equally head-turning looks both before and after landing the role of a lifetime.

When we were first introduced to Kaley Cuoco in 2002, she had the ultimate, trendy girl-next-door look. At the ABC Summer Press Tour All-Star Party, she wore her long, warm, blond hair straight and down with distinctive lowlights at the back. Her shiny tresses were layered too, which was a big Y2K trend.

That same year, the teenage "8 Simple Rules" star hopped on another huge trend of the time when she sported very chunky, unblended highlights at an ABC Primetime Preview Weekend event.  Her look was a mix of light blond and strawberry blond shades, which helped warm her complexion and kept her looking fun and youthful. 

Chunky highlights became the hair trend of the moment again in 2024, but were even bigger in the '90s and early '00s when everyone from Geri Horner (aka Ginger Spice) to Kelly Clarkson rocked the divisive look.