Celebrity Philanthropy

Leonardo DiCaprio stepped out for the Brant Foundation Art Study Center's Andy Warhol showing on Sunday in Greenwich, CT. The event, which featured several of the artist's greats hits such as "Flowers" and "The Last Supper," was also attended by Owen Wilson, Stephanie Seymour, and Sharon and Aimee Osbourne. While Leo made a quick entrance into the center, he has been a red carpet fixture over the previous weeks for Great Gatsby promotions. His much-anticipated film was released Friday but could not quite top the box office over the weekend, coming in No. 2 to still-reigning Iron Man 3.

Leonardo, though, has already switched gears and is utilizing the art world for his more charitable endeavors. The actor and his environmental foundation joined forces with Christie's for a charity auction in NYC today to benefit environmental causes. The event is called The 11th Hour Auction, and Leonardo's foundation hopes to raise over $18 million for causes such as wildlife and endangered-species protection. Thirty-three pieces from top artists including Banksy, Andreas Gursky, Bharti Kher, and others will be at the bidding stake, while Leonardo himself donated his "Ocean V" by Andreas to the auction.

Emma Stone and Olivia Wilde met up in NYC today for Revlon's annual EIF Run/Walk For Women. The duo, who are ambassadors for the brand, hosted the event, which helps raise money for research, treatment, and support for medically underserved women with cancer. Olivia urged fans to join them for the cause on Twitter yesterday, writing, "Emma Stone and I need you to come hang out with us tomorrow: Saturday. In NYC. Don't stand us up!"

Emma shared her beauty tips during last week's launch of Revlon's new Lash Potion Mascara in the Big Apple. When she's not working with the beauty brand, Emma's been spending time with boyfriend Andrew Garfield, and the couple attended the opening-night party for the new play Bull on Thursday. He joined her again for the race today and brought along a service dog that they walked with while showing PDA for each other.

Chris, Liam, and Luke Hemsworth joined several celebrities in LA on Saturday for City Year's third annual Spring Break: Destination Education party, a fundraiser to keep at-risk students on the path to graduation. The Hemsworth brothers posed on the red carpet with AmeriCorps members — who serve as tutors, mentors, and role models to students — while television heartthrobs Ed Westwick and Max Greenfield followed suit. The nonprofit cause also brought out Julianne Hough, Rashida Jones, Hailee Steinfeld in a striped Dolce & Gabbana dress, Octavia Spencer, and others.

Inside the event, stars snacked on food, checked out interactive booths, and caught performances from DJ Sky Blu of LMFAO and Skylar Grey. Octavia was on hand to pass out City Year jackets as one of the organization's host committee members, which included Channing Tatum, Anne Hathaway, Vince Vaughn, and others who were unable to attend.

Bradley Cooper posed at the bedside of Boston Marathon bombing survivor Jeff Bauman at Boston Medical Center this week. Bradley, who has been on location in the area filming American Hustle with Jennifer Lawrence, was also accompanied by Massachusetts Senator Elizabeth Warren and Julian Edelman of the New England Patriots. The survivor, Jeff, lost both of his legs in the attack and also reportedly helped authorities identify one of the suspects despite his current medical state.

Bradley wasn't the only one to show his support for the victims and survivors of the tragedy as President Obama touched down in Boston yesterday to pay his respects at Massachusetts General Hospital. He also thanked emergency crews and law enforcement officers who have been tirelessly working on the case. The president left the city with a message of hope in his address, saying, "We may be momentarily knocked off our feet, but we will pick ourselves up. We will keep going. We will finish the race."

Currently, the entire city of Boston is on lockdown while authorities search for a second suspect believed to be responsible for Monday's Boston Marathon bombings, which left at least three dead, including an 8-year-old boy, and hundreds injured. The first suspect, Tamerlan Tsarnaev, was killed last night.

Matthew McConaughey and Camila Alves were glowing on the red carpet in Austin yesterday. The couple posed for pictures on their way into ACL Live at The Moody Theater, where Matthew, in his blue suede shoes, introduced a performance by John Mellencamp. The gala concert was part of a two-day charity event, which continues today, put on by the Mack, Jack & McConaughey foundation. Matthew and Camila teamed up with University of Texas head football coach Mack Brown and his wife, Sally, and singer Jack Ingram and his wife, Amy, to create the organization, which supports programs for underserved children. The event was the group's first fundraising effort since joining together late last year, and they'll be back in the spotlight today with a Celebrity Classic Golf Tournament and at a special Lela Rose fashion show at Neiman Marcus.

Angelina Jolie traveled to London to attend the G8 summit today. She held a Salvatore Ferragamo handbag as she met with Britain's Foreign Secretary William Hague on the steps of Lancaster House before heading to the conference. Angie and William are hardly strangers — the two teamed up for a philanthropic trip to Africa to raise awareness about sexual violence in war zones back in March.

Angelina continued her campaign against rape at the G8 summit, where she addressed a crowd of world leaders about wartime sexual assault victims. She said, "I have heard survivors of rape from Bosnia to [the Congo] s ay that the world simply does not care about them. But today I believe that their voices have been heard, and that we finally have some hope to offer them." Angelina has been keeping busy over the past few weeks with a host of charitable events. She attended the Women in the World Summit last week to introduce a video made by Pakistani schoolgirl Malala Yousafzai. She also pledged to donate $200,000 to the Malala Fund, a new charity that aims to encourage girls' education.

Angelina Jolie showed her support for Malala Yousafzai at the Women in the World Summit, organized by Newsweek/The Daily Beast, in NYC last night. She wore a Saint Laurent maxi dress and coat as she introduced a video message from the Pakistani schoolgirl who got international attention after she was shot by the Taliban for promoting girls' education. Angie said, "Here's what the gunman and the Taliban accomplished on that day. They shot her at point-blank range in the head — and made her stronger." Angelina has also donated $200,000 to the Malala Fund, a new charity set up by Vital Voices to encourage girls' education. Other stars who attended the Women in the World Summit included America Ferrera, Daily Beast editor Tina Brown, and Meryl Streep.

Angelina has been busy with philanthropic work over the past few weeks. She recently traveled to Africa with Britain's Foreign Secretary William Hague to raise awareness about rape in war zones.

Angelina Jolie was joined by Britain's Foreign Secretary William Hague today when she visited victims of sexual violence in the Democratic Republic of Congo. She and William are touring the DRC and Rwanda to raise awareness about rape in war zones. Angie was with William today when he announced that the UK will be donating over $300,000 toward the Physicians for Human Rights in an effort to create a better method of collecting evidence of sexual violence in these areas. Unfortunately, the two couldn't visit Panzi Hospital, where the charity group works out of, due to bad weather, but they did meet with other survivors at a refugee camp. Angelina and William also laid wreaths at the Gisozi genocide memorial in Kigali, Rwanda, during their charitable travels.

While Angelina is in the spotlight for her philanthropic work, she's also turning heads with a new piece of jewelry. Angelina wore a gold band on her ring finger, instead of her diamond engagement ring, as she caught a flight out of LAX last week.