Dozens of the world's top movie, television and music stars showed off their green cred on Saturday night at a Hollywood-style fundraiser honoring the Natural Resource Defense Council's 20 years in Southern California.

The event at Beverly Hills' Regent Beverly Wilshire Hotel was a who's who of Hollywood environmentalists, including actors Leonardo DiCaprio and Robert Redford, and Laurie David, a global warming activist and producer of the Al Gore movie "An Inconvenient Truth." All three are trustees of the NRDC's Southern California office. In 2003, the group even dedicated its new building to Redford.

It's no secret that the environment and climate change is a hot cause in Hollywood, and it's hard to imagine another social issue drawing as much star power to one event. The party also raised a hefty $2 million.

"Mad Men" star Jon Hamm and designer Tom Ford also attended the party, which was hosted by "Seinfeld" star Julia Louis-Dreyfus and included a musical performance by Grammy-winning rockers Maroon 5. Actress Rosanna Arquette deejayed the after party.

On stage, Redford recalled why he joined the NRDC in the 1970's, saying it was "because they had the power to sue."

Many attendees echoed that refrain throughout the night, with Louis-Dreyfus bluntly stating: "I love lawsuits."

The evening also included a list of the group's legal victories in the region, including helping to stop inadequately treated sewage from being dumped into the Santa Monica Bay and testing children for lead poisoning in the 1990s. More recently, NRDC and other environmental groups last year reached a deal with land holder Tejon Ranch to permanently protect 240,000 acres of California land from development.

But the group also suffered a setback in the region last year after the Supreme Court ruled that the U.S. navy can conduct sonar training exercises off the southern California coast without restrictions to protect whales, dolphins and other marine mammals.

Perhaps unsurprisingly, the evening was as green as could be, with a vegetarian, locally sourced menu, organic wine, and trees and bushes as decoration. Even the table centerpieces didn't require watering, instead featuring asparagus and artichokes and tulips planted in stones.

Photocredit: Reuters (Maroon 5 performs at the NRDC's 20th Anniversary Celebration in Beverly Hills on April 25, 2009)

In honor of Earth Day on Wednesday, environmental Web site GreenDaily.com has named singer Mariah Carey the “least green celebrity.” What did Carey do to deserve the dis? She was quoted as saying that she flies her personal trainer from St. Barts in the Caribbean to New York to keep her on a workout regimen.

The AOL-owned GreenDaily.com created the “least green” celebrity list in cooperation with social networking site Bebo.com, based on an online poll.

A spokeswoman for Carey was not available.

While Carey was voted least green by 35 percent of respondents, another 27 percent said actor John Travolta was Hollywood’s worst environmental offender for his use of private jets, which GreenDaily.com said are responsible for 800 tons of carbon emissions per year.

Who is Hollywood’s greenest celebrity? Thirty-six percent of the poll’s respondents said actor and longtime environmental activist Leonardo DiCaprio. He topped the list, followed by U2 frontman Bono and actor Ed Begley Jr., the former “St. Elsewhere” star who has been known to sell his own green cleaning spray at the farmers market on weekends.

It’s a green world out there, at least on Earth Day. And with Web sites like GreenDaily.com trolling through Hollywood, woe to the stars who live it up and forget about their carbon footprint.

Celebrities Leonardo DiCaprio, Forest Whitaker, Tobey Maguire and will.i.am are out to convince young people to vote — and they have made a series of public service announcements for the cause in partnership with Google, YouTube, Declare Yourself and MySpace.
     
While many of the celebrities have shown their support for Democratic presidential candidate Sen. Barack Obama, the PSAs are meant to be non-partisan in tone and content, so don’t expect any digs at Sen. John McCain, the Republican presidential candidate.
    
In the first ad, stars including Jennifer Aniston, Halle Berry, and Ashton Kutcher, address viewers directly and urge them in a tongue-and-cheek way not to vote, before going on to not only call on the viewers to vote but to make sure they are registered and that their friends, too, are registered and are voting. You can watch it here.

The PSA was produced by DiCaprio’s company, Appian Way Productions. This past weekend, we interviewed DiCaprio and he talked about his desire to get young voters to the polls. “My big message on this next election is that, hopefully, the youth movement will come out in full force this time,” DiCaprio said. “Hopefully we will have a true representation of this country because enough young people who care about policies for the next 50 years will go out to the polls and vote for the candidate they think best represents the United States.”

Alot has been made about the youth vote in this year’s election, and Obama has had a great deal of success in engaging young Americans. He even listens to hip hop music. Yet, time and again in U.S. elections, young people have failed to turn out at the polls in the numbers that older citizens do. Maybe this will help; maybe not. But it can’t hurt. If you’re in your 20s, will you vote? The election is Nov. 4.

It’s not easy making love in Hollywood — at least not in front of movie cameras.
    
Actors Leonardo DiCaprio, 33, and Kate Winslet, 32, had a lovemaking scene in the upcoming drama “Revolutionary Road,” which was directed by Winslet’s husband, Sam Mendes. Winslet said filming the scene took some adjustment.
    
“I just kept saying, ‘This is too … weird,’” Winslet told Entertainment Weekly magazine. 
    
“And Leo was like, ‘Oh get over it.’ And I’m going, ‘Yeah, a little reminder: You’re my best friend. He’s my husband. This is a bit weird,” Winslet told the magazine.
    
For DiCaprio and Winslet, the sex scene was a reprise of sorts, because they had some steamy on screen lovemaking together in the 1997 blockbuster hit “Titanic.”
    
Actress Rachel McAdams, 31, the Canadian-born star of “The Notebook” and “Mean Girls,” took a similar position on love scenes in an interview with the New York Times publication T Magazine.
    
“A kiss with anyone, on or off camera, can be intimidating,” McAdams said in the interview, which was featured on the magazine’s Web site on Friday.
    
“I’ve been kissing for nearly two decades now and I’m always convinced I’m not doing it right. Chemistry is so important in a great kiss. You can act your way through anything, but it’s hard with a kiss.” 

(Reporting by Alex Dobuzinskis)