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May cover girl Cameron Diaz and Russell Simmons spoke up for science at the fourth annual Greenhouse Project Benefit, hosted by New York Sun Works at the Standard Hotel in New York City. “Uplifting one student at a time through science education. Great work,” Tweeted Simmons en route to the event. The yearly gathering helps the organization raise money to build science labs on the roofs of public schools. Click through to see more stars at last night’s biggest parties.

Princess Charlene of Monaco is the latest celeb to go short. The royal traded in her shoulder-length blond strands for a sleek, side-parted crop, which she debuted at the Monte-Carlo Rolex Masters tennis tournament over the weekend. We must say, this style looks so classy on the princess! Tell us: What do you think of her streamlined new ‘do? Let us know in the comments.

See Princess Charlene’s latest outfits in the gallery!

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