Salma Hayek

Leonardo DiCaprio teamed up with Christie's to co-host the 11th Hour Auction in NYC last night. It was a successful event for Leo since the auction reportedly raised $35 million to benefit environmental and wildlife conservation efforts, almost doubling the goal of $18 million. He had the support of his long-time friend and Great Gatsbyco-star Tobey Maguire, who put in a winning bid on one of 33 pieces of contemporary art. Leo contributed something from his own art collection, a print called "Ocean V" by well-known photographer Andreas Gursky. Also out for the evening were Bradley Cooper, Mark Ruffalo and Salma Hayek.

It was Leonardo's second art-inspired outing in as many days, since he also made an appearance at the Brant Foundation Art Study Center's Andy Warhol showing in Greenwich, Connecticut, on Sunday. He'll be switching gears from art to film in the coming days, though, when he debuts The Great Gatsby in Cannes later this week.

In honour of Earth Day today, we're taking a look at the celebrities who love giving back. Whether they're thinking green in their own lives or promoting environmental habits and products, these stars do their part to help clean things up.

Click through our slideshow to see who made the list, and be sure to check out all of our eco content to celebrate Earth Day.

We have the third annual CinemaCon to thank for bringing together some of our favourite stars in one place: Las Vegas. Sandra Bullock, Elizabeth Banks, and Hailee Steinfeld are just three of the style-setters who made up this year's list of attendees — and we're looking to their dressed-up looks for serious cocktail-party inspiration. Without further ado, step inside to see who wore what at this year's CinemaCon.

Salma Hayek was in Long Beach, California, yesterday to officially launch Chime For Change, a new charity initiative devised by Salma, Beyoncé Knowles, and Gucci, at a TEDxWomen event. Salma's husband, Francois-Henri Pinault, is the CEO of French luxury company PPR, which owns Gucci, and as such, is the driving force behind the project, which aims to raise funds and awareness to support projects by women around the world. Beyoncé was not able to attend yesterday, but Salma nonetheless posed for photos with other guests, including Jada Pinkett Smith.

Salma took the stage to speak about the project and introduce a short film that featured Beyoncé. In a press release announcing the endeavor, Beyoncé spoke about what Chime For Change means to her. She said, "I have always felt strongly about equal opportunity for women. Girls have to be taught from early on that they are strong and capable of being anything they want to be. It's up to us to change the statistics for women around the world. I'm honoured to be in the company of women who live fearlessly and set an example for the next generation of young ladies."

Milan Fashion Week wraps tomorrow, but before we move on to Paris, let's take in all the glamorous looks from the front-row fashion pack. Most recently, we spotted Ashley Greene looking cool in an icy-hued ensemble at the Salvatore Ferragamo show. Before that, Olivia Palermo made a posh arrival at Roberto Cavalli in a fur collar, printed coat, and black leather pants, while Fergie made her way to Giorgio Armani's show in a white suit. Step inside to see all the celebrities lining MFW's front rows.

After posing on the red carpet outside the Vanity Fair Oscars after party, the fun continued inside the Sunset Tower! Jennifer Aniston, who loves having a drink at the famous LA hotel, cosied up with her fiancé Justin Theroux in a corner banquette. They mingled in a crowd that included Miranda Kerr, Orlando Bloom, Salma Hayek, and many more celebs. Best supporting actress winner Anne Hathaway, having changed into a Saint Laurent gown from her pink Prada gown, smiled alongside her husband Adam Shulman. Diane Kruger, Joshua Jackson, Kate Bosworth and other stars who didn't attend the actual Academy Awards show also mingled in the crowd.

Harvey Weinstein's pre-Oscars party is one that the stars look forward to every award season, and this year the likes of Kerry Washington, Jennifer Lawrence, Salma Hayek, and many more came out to play the night before the big show. With the exception of a few ladies like Nina Dobrev, most celebs stuck to all-black for the festivities. Kerry was fashion-forward in an asymmetrical LBD, Jennifer looked effortless in a tuxedo-inspired getup, while Salma showed off her curves in a formfitting lace dress. Step inside to see who else wore black (and who didn't) to the Weinstein pre-Oscars bash.

The Weinstein Company teamed up with Chopard for their pre-Academy Award party at Soho House last night. Stars from the company's films Silver Linings Playbook and Django Unchained made the rounds on the night before the Academy Awards. Jennifer Lawrence wore a jumpsuit following her afternoon wearing Lanvin at the Independent Spirit Awards, where she picked up a trophy for best female lead and the movie itself was crowned best picture. Her co-star Bradley Cooper, as well as their director David O. Russell, also made the rounds at Soho House. Django's Kerry Washington, Jamie Foxx, Christoph Waltz and Don Johnson also celebrated before the Oscars, along with Salma Hayek and The Vampire Diaries actors Nina Dobrev, Ian Somerhalder and Paul Wesley.

The pink carpet was rolled out for today's Spirit Awards, which recognises the achievements of independent filmmakers, and Jennifer Lawrence, Kerry Washington, and Camila Alves are just a few of the famous faces that made an appearance. Click through to see how some of your favourite stars got gorgeous just one night before the Oscars.

Although not as many celebrities tend to show face during Milan Fashion Week as they do in other cities, it's still prime time to do some serious star spotting. And with shows like Versace and Roberto Cavalli taking place this week, who could blame celebrities for wanting a first look at all that eye candy? Flip through to see which famous faces have ben spotted in Milan.