On the day before Earth Day, environmentally-minded celebs took part in the eco-promoting children's book and toy line Greenzys' first annual Earth Day celebration at the Ron Robinson/Fred Segal store. Ed Begley Jr., who attended with his wife Rachelle and daughter Hayden, didn't plan to do anything special to commemorate the holiday. "For many people it's a one-day-a-year thing, but for me the other 364 days are just as important," Begley explained. "I'll do the same thing I do every day — ride my bike, check my solar panels and keep my energy bills low, and take public transportation as I do a lot," he said, showing his MTA transit pass that any size corporation can buy for $14 a month. "I use it when I go downtown and to Hollywood."

Begley is in the process of building a LEED platinum-certified home a quarter-mile east of his present home, which was built in the 1930s "and there's a limit to what you can do. The new house will be green from the ground up. It'll be done about a year from now," noted the actor, who'll find out in mid-May if his NBC pilot for a series called "The New World," about a Colonial Williamsburg-like theme park in which he plays the owner, will be on the fall schedule. He'll also appear in the September comedy "What's Your Number?" with Anna Faris and Chris Evans.

Heading off on vacation to Cabo San Lucas, Mexico, for Earth Day weekend, Kristin Cavallari ("The Hills") does "all the little things" she can to be more eco-conscious. "I recycle everything that can be recycled. I turn off the lights when I'm not in the room or using them. I take short showers," she said. She also cut down on her meat consumption after reading the book "Skinny B*tch." Cavallari designed a shoe for ShoeDazzle.com that will be available May 15, with proceeds going to her chosen charity, One Kid, One World, which helps build schools in El Salvador. She's also developing and casting a reality show. "I'll be in an episode or two but it's really about producing. I love having a say in everything that goes on and I get to call the shots," she said. "It's fun, and I have creative input, as well."

Also on hand was James Van Der Beek with his wife Kimberly, who has been a big green influence on him. "He's buying eco-friendly cleaning products. He's eating healthier, more organic foods," she said. "He's totally into it now." Van Der Beek has several projects in development including an ABC pilot called "Don't Trust the B*tch in Apartment 23." He'll learn whether it's on the fall schedule next month.

One of several cast members from Disney Channel's "Shake It Up" in attendance, Roshon Fegan told us he always conserves water. "I turn off the water when I brush my teeth. Mom always taught me that. I recycle. And I have a lot of bamboo clothing. It's green and it looks cool."

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