If there's one thing Cameron Diaz isn't - it's a litterbug. The star was out collecting garbage on the set of her latest film, The Holiday, after shooting an outdoor scene. "After shooting was over, she'd always leave the set picking up any stray litter or papers that were left behind," said a set insider. The star is also known for treating her staff well. "Her hair and makeup assistants...are more like old friends than employees," said the insider. "Cameron always makes sure they're staying in the same hotel, so they can hang out. They arrive on set giggling and chatting like old mates."