Pippa Middleton
The little sis to the Duchess of Cambridge looked radiant in red when she opened the Christmas designer sale at the Red Cross Shop in London. Oh, and did we mention that's recycled fashion she's rocking?
Alec Baldwin
The 30 Rock star donated $1 million to a scholarship program at his alma mater, New York University's Tisch School of the Arts, where he graduated in 1994 with a Bachelor's Degree in Fine Arts. The funds will be applied to the Alec Baldwin Drama Scholarship fund and the university's Talent Identification Process, which also provides financial aid to students.
Kenny Chesney
The country crooner kicks off the 122nd annual Salvation Army Red Kettle fundraising campaign with a performance during the Dallas Cowboys vs. Washington Redskins Thanksgiving Day football game. This year, the funds raised will support people in need, including those still experiencing the lasting impact of Hurricane Sandy
Kevin Spacey
The actor gets goofy while cohosting the Grey Goose Winter Ball alongside David Furnish to benefit the Elton John AIDS Foundation in London.
Kelly Clarkson
The American Idol winner takes a break from prepping for the 2012 Country Music Awards to sign Patrón Tequila's giant guitar, which will be auctioned off to support Keep the Music Playing, a group that provides financial support to benefit music education programs around the country.
Viola Davis
The Oscar nominee hosted the Rape Treatment Center's annual brunch, where she told us, "I want to be a part of the healing. I feel like that's a good life purpose."
Olivia Wilde & Katharine McPhee
Celebs gather at Global Citizen Festival in Central Park to celebrate ending extreme poverty.
Giuliana Rancic
E! News anchor and breast cancer survivor kicks off the P&G GIVE Hope "Do It For the Girls" Day of Action, by encouraging women to perform a breast self-exam.
Wilmer Valderrama & Demi Lovato
The former couple reunites to film a PSA called "The Enforcers" for political org Voto Latino encouraging people to register to vote.
Common
The rapper performs during Virgin Mobile's "From the Ground Up" benefit to help battle youth homelessness in the Chicago-area.
Kiss & Motley Crue
Rock on for a good cause. The legendary band members of Kiss and Motley Crue donated $250,000 to Hire Our Heroes during a free concert in Washington, D.C., before launching The Tour. The charity assists U.S. military veterans deal with unemployment.
Tyson Beckford, Sharon Stone & Gilles Marini
The good-looking group of celebs help support HIV/AIDS research at the 3rd annual Kiehl's LifeRide event, where Stone presented do-gooder group amfAR with a $115,000 check.
Lea Michele
The Glee gal gets her hands dirty at the Valspar Hands for Habitat event, an initiative that auctions off celebrity handprints to benefit the org's disaster relief programs. "I think it's great when something takes two seconds, [it's] really quick, and it makes such a difference," she told us. "I think it's really worth it."
Harry Shum Jr. & Jamie Chung
The Hangover 2 actress and Glee guy step out during AIDS Walk San Francisco to raise money in Golden Gate Park. Nearly 20,000 walkers helped raise $2.7 million for 46 Bay Area AIDS service organizations.
Danny Masterson, Columbus Short & Wilmer Valderrama
The celebrity golfers jump for joy at Ryan Sheckler's 2012 X Games Celebrity Golf Tournament in Rancho Palos Verdes, Calif. The tournament raised more than $150,000 for the Sheckler Foundation.
Marvel Comics' Captain America, Thor and Wolverine
Marvel Entertainment teams up with Susan G. Komen for the Cure and goes pink for breast cancer! In October, selected Marvel superheroes will battle the bad guys with pink-hued costumes on the covers.
Peter Dinklage
The Game of Thrones star (and longtime vegetarian) promotes Farm Sanctuary's Walk for Farm Animals event.
Carrie Underwood
The country star has lent her support to the gay community: "As a married person myself, I don't know what it's like to be told I can't marry somebody I love," she told the Independent. "I definitely think we should all have the right to love, and love publicly, the people that we want to love."
Bill Clinton
The former president is honored for his global advocacy on behalf of children at the Sesame Workshop organization's 10th annual benefit gala hosted by Jon Stewart at Cipriani restaurant.
Angelina Jolie
The actress and United Nations Goodwill Ambassador joins Britain's foreign secretary William Hague in London to help launch an initiative to combat sexual violence in war zones.
Liv Tyler & Jamie Oliver
The actress and celeb chef chat at the first annual Food Revolution Day luncheon in New York City, which was part of a host of events celebrating awareness of real food.
Lady Antebellum
The Grammy-winning trio helped raise over $285,000 for the tornado-ravaged town of Henryville, Ind.
Ringo Starr
In an effort to draw attention to the plight of endangered rhinos, the former Beatle turned his website into an ad for the creatures and those who protect them.
Rosario Dawson
The actress speaks during the Our Voices: Celebrating Diversity in Media event as part of Voto Latino's ON Series at the Hay Adams Rooftop in Washington, D.C. Voto Latino works to empower American Latinos to vote and get involved in political processes.