Beyonce Knowles, Gwyneth Paltrow, Jennifer Aniston, Michelle Williams, Reese Witherspoon, Kate Hudson, Cameron Diaz, Ellen DeGeneres, Julianne Moore, Chris Rock, Jamie Foxx, Olivia Munn, Selena Gomez, Paul Rudd, Jon Hamm, Jennifer Westfeldt, Will Ferrell, Sarah Silverman, Amy Poehler, Adam Scott, Rashida Jones, John Slattery, Jeremy Renner, Conan O’Brien, and others join together in the fight against gun control, in a new PSA for DemandaPlan.org.

The campaign, started by Mayors Against Illegal Guns, comes a week after the horrific massacre in Newtown and amid the polarizing debate rippling through the U.S. about gun violence and the Second Amendment.

Looking into the camera, they read through a list of some of the 31 similar attacks carried out in the US since Columbine in 1999.

‘Virginia Tech. Tucson. Aurora. Fort Hood. Oak Creek. Newtown. How many more?’ they ask. Watch the moving PSA here:

From the Hamptons to Hollywood (and beyond)… where were the stars this week?

Bethenny Frankel was spotted at the Skinnygirl Cocktails Rock the House Party in the Big Apple. The Bravo reality star looked fab for the press at Drive In studios! Also there to enjoy the festivities were actresses Rachael Leigh Cook and “How To Think Like A Man” star Gabrielle Union.

Many famous faces took to Villa St. George for a party as part of the 65th Cannes Film Festival this week! Among those turning up at The IFP, Calvin Klein Collection $ euphoria Calvin Klein Celebration of Women In Film were Shailene Woodly, Jessica Chastain, Jada Pinkett Smith and Naomi Watts! Seems like a party… Chris Rock was also there bringing some more fun!

A roster of TV heavy hitters showed up at Lilium on Tuesday night for The Gersh Agency Upfronts party. Revenge star Josh Bowman dropped by sans girlfriend and co-star Emily VanCamp, but was thrilled to see his TV mom Madeleine Stowe. Chris Noth, Kyle MacLachlan, Heather Graham, John Slattery, Talia Balsam, Josh Radnor, Matt Czuchry, Scott Porter, Rachel Bilson, Jesse Metcalfe were also among the crowd and seemed to all be enjoying themselves at the star studded event.

That 70s Show co-stars Mila Kunis and Danny Masterson were spotted at NYC hotspot Beauty & Essex on May 14th celebrating two friends’ birthdays. Mila, a huge fan of ‘Chopped’, was excited to meet Chris Santos. After taking photos with Chris and a few fans, Mila and Danny enjoyed some of Beauty and Essex’s Box of Doughnuts and Butterscotch Pot de Crème!

Thursday’s IAC Internet Week Closing Party brought together the tech savvy and trendy. GIRLS’ Allison Williams and CollegeHumor cofounder Ricky Van Veen were in attendance in addition to funny man Will Arnett, who took over the stage to “guest DJ” but his email and facebook account kept interrupting him. VEEP’s Anna Chlumsky and Actor Tyrese sampled specialty cocktails in the Match.com Lounge and Wilmer Valderamma worked the crowd to promote his new YouTube projects.

KEEP READING FOR MORE STAR SIGHTINGS THIS WEEK…

PHOTO: Jason Kempin/Getty Images North America via Zimbio

Ricky Martin looked like a million bucks at the opening night festivities for his “Evita” Broadway gig at the Marriott Marquis Hotel in New York City. Martin has been working hard and is ready to show off his stage skills!

Kid Cudi spotted on the mic hyping the crowd from the DJ booth at boutique Hollywood nightclub AGENCY Tuesday, as Fernando Garibay, official musical director for Lady Gaga during the making of album “Born This Way,” played an entrancing DJ set.

Mad Men’s Jon Hamm and John Slattery sawing into steaks at Ben Benson’s with NBC’s Brian Williams, Al Roker, Today Show Producer Jim Bell, PR Man Jon Harris and Andy Ostroy of the Adrienne Shelly Foundation. Ben Benson himself came out to greet the crew, who gathered for a charitable lunch to benefit the Foundation.

CMT star Melissa Rycroft kicked off her heels and slipped into some chic and comfy Crocs at The Palazzo Hotel in Las Vegas this weekend for some much needed R&R with her family – husband, Tye Strickland and daughter, Ava Grace. Ava Marie was spotted in Croc’s Keely shoes in a Navy/Pink Lemonade.

Jake and Maggie Gyllenhaal were spotted out and about in the big apple this week. The stud and his pregnant sister walked through Chinatown while the paparazzi captured some good shots! Nothing like some sibling bonding!

Kim Kardashian goes west…no pun intended. The reality star was spotted at JFK airport catching a flight out of NYC back to good ol’ LA! She looked cute and casual wearing a printed white top and a big smile as well!

FOR MORE STAR SIGHTINGS THIS WEEK, KEEP READING…

PHOTO: Charley Gallay/WireImage.com

Backstage at the 63rd Annual Primetime Emmy Awards, it wasn’t just about relaxing, unwinding and getting gifted… It was also about giving back!

I Can’t Believe It’s Not Butter enlisted MJ to host their “Toast Bar” in the HP TouchSmart Backstage Gift Lounge, where stars made a “toast” to unbelievable people and moments in television, with every celeb signature helping to raise money to The Academy of Television Arts and Sciences Foundation.

Some stars, like Charlie Sheen and “Glee” stars Jane Lynch and Lea Michele opted for “no photos” but were happy to lend their signature for a good cause.

CLICK HERE: PEACHY GALLERY! THE HP TOUCHSMART GIFT LOUNGE BACKSTAGE AT THE 63RD ANNUAL PRIMETIME EMMY AWARDS

Other stars that stopped by to make a “toast” included: Adrien Grenier, Akiva “Kiv” Schaffer, Akon, Andy Samberg, Brooke Burke, Charlie Sheen, Chris Noth, Christina Hendricks, Eva La Rue, Ian Somerhalder, Jane Lynch, Jennifer Carpenter, Jeremy Piven, John Slattery, John Stamos, Julia Stiles, Kevin Dillon, Laurence Fisburne, Lea Michele, LL Cool J, Maria Menounos, Mario Lopez, Maya Rudolph, Minka Kelly, Paula Abdul, Rashida Jones, Rob Lowe, Taraji P. Henson, The Canadian Tenors, Tracy Morgan, Ty Burrell, Zachary Levi and so many more!

Celebrities received a deluxe gift collection featuring an elegant sterling silver spreader from Tiffany’s, a champagne-colored toaster, and an exclusive VIP Gold Card for home delivery of I Can’t Believe It’s Not Butter products (“30 Rock” star Tracy Morgan loved this!).

CHECK OUT MORE TOASTY “HOT SHOTS!” FROM THE I CAN’T BELIEVE IT’S NOT BUTTER “TOAST BAR”…AFTER THE JUMP!