What's the latest hair trend among celebrities? It's not bobs (they're past being trendy, they're officially here to stay), it's not subtle ombre. It's bright, bold hair color - straight from the rainbow!

Anna Paquin is the latest celebrity to join the crazy hair color train, saying goodbye to True Blood's Sookie Stackhouse for good with purple and blue mermaid-like hair! Before Anna, our favorite lavender-haired beauty was Nicole Richie, but she's just switched to blue and we love it even more.

From orange to purple to GREEN and more, click through the gallery above to see the boldest hair color transformations this summer!
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