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:

© RD / Orchon / Retna Digital

Boyz II Men were honored with a coveted star on the Hollywood Walk of Fame in Los Angeles. Also there to support was mega music singer-producer Kenny ‘Baby Face’ Edmonds, who said a few touching words about the guys.

Real Housewives of Beverly Hills’ Kyle Richards promoting her new book Life is Not a Reality Show, while husband Mauricio stayed close by but in the background as Kyle soaked up the spotlight at new rock and roll club RokkCity in NYC yesterday.

Kid Cudi hanging out in a corner booth with the company of a blonde female friend and near DJ Travis Emmons, who spun sounds that kept the crowd partying all night at exclusive boutique nightclub, Agency, in LA on Tuesday night.

“Haywire” held its Los Angeles premiere this week. The DGA Theatre was packed with familiar faces with stars like Ewan McGregor, Channing Tatum (with Jenna Dewan), Dominic Monaghan, and Gina Carano giving the fans and press an eventful evening!

Getting back into the swing of things after the holiday season, Halle Berry was spotted walking her daughter Nahla to school in West Hollywood this week. Berry, beautiful as always, was dressed casual in a light grey t-shirt, dark grey scarf!

Kim and Khloe Kardashian were spotted at the American Airlines Center in Dallas, Texas last night to support Lamar Odom and the Dallas Mavericks take on the Phoenix Suns! The sisters also hit up Stanley Korshak’s shop, where they purchased a few pairs of furry boots and trendy handbags to match before the game!

KEEP READING FOR MORE STAR SIGHTINGS THIS WEEK…

Boyz II Men - TWENTY

The new double album, TWENTY, from the Grammy winning group Boyz II Men lived up to its name this week!

The album broke the Billboard Top 20 in its first week of release, meeting critical raves and was even named ‘Pick of the Week’ by several media outlets.

Not bad considering their first album was released 9 years ago!

It seems that the R&B scene has welcomed the talented band back. Those who saw Boyz II Men perform this week on ‘Dancing With The Stars’ alongside T know that their catchy tunes are just as stellar as they were in the 90′s.

TWENTY features producers such as Babyface, Jimmy Jam & Terry Lewis, Teddy Riley, as well as Julian Bunetta (Leona Lewis, Natasha Bedingfield) and Tim/Bob (Jamie Foxx, Jennifer Lopez), and more! The double CD set will contain 12 new tracks and 8 re-imagined Boyz II Men classics, such as “End Of The Road,” “I’ll Make Love To You,” and “Bended Knee”.

MJ can’t stop listening to this album!

PHOTO: Jesse Grant/WireImage

Nicole Richie looked absolutely stunning in a white frock and fishtail braid at the launch of Bing Entertainment on Tuesday eve (Jun 22) at Boa Steakhouse in LA.

MJ is totally loving that black and white ring — wonder if it’s from her jewelry line, House of Harlow, named after her gorgeous lil’ girl?

The star-studded launch event, which was hosted by the totally ubiquitous Ryan Seacrest, was also attended by Drake, DJ Cassidy, Ryan Phillippe, Zoe Saldana, Joseph Gordon-Levitt, Elizabeth Banks, Jamie Foxx, Maria Menunos, Leonardo DiCaprio and more.

E! Online’s Marc Malkin reports that the starlet (who just had her probation extended) stayed for about 45 minutes, making sure to stay to catch a performance by Drake!

Photo Courtesy: Seth Browarnik/Red Eye Productions

The city of Miami has seen possibly the single best week in parties they’ve ever seen this week — thanks to a star-studded Superbowl!

The other night, TAO held a Superbowl party at the W South Beach hotel that was chock-full of boldfaced names including DJ Cassidy, Damon Wayans and brother Marlon Wayans, Dave Annable and new girlfriend Odette Yustman,

The highlight of the night, insiders at the party tell MicahJesse.com, was an impromptu performance by Jamie Foxx (pictured above) who sang the Run DMC song “King of Rock.”

In Miami, Mister Foxx doesn’t blame it on the a-a-alcohol — he blames it on the rock! (…and roll?)

Photo: WireImage

Wow, guys!!!

What a picture!

In this unbelievable mix of talent:

Celine Dion, Gladys Knight, Justin Bieber, Usher, Kristian Bush, Barbra Streisand, LL Cool J, Harry Connick Jr., Vince Vaughn, Jeff Bridges, Toni Braxton, Miley Cyrus, Kanye West, Jennifer Hudson, India.Arie, Wyclef Jean, Snoop Dogg, Akon, Lil Wayne, LL Cool J, Lionel Richie and producer Quincy Jones, Jamie Foxx, Carlos Santana, T-Pain and Joe Jonas, Joel Madden and daugher Harlow Madden, Tyrese Gibson, and Nicole Scherzinger among others — team up for the “We Are The World 25 Years For Haiti” Recording Session yesterday (Feb 1) in Los Angeles, CA.

“Tonight was one of the greatest experiences of my life,” Bieber said. “Singing WE ARE THE WORLD with all those stars and taking direction from the greats. I’m a small town kid who started a YouTube page for fun 3 years ago. Tonight I sang with some of my heroes. Still in shock and super grateful…DREAMS DO COME TRUE- believe that.”

The original recording session, called USA For Africa, was recorded on Jan. 28, 1985, and featured 46 pop and rock stars (this time around there was 100!), including Diana Ross, Billy Joel, Ray Charles, Tina Turner, Stevie Wonder and Willie Nelson. The song “We Are the World” was written by Jackson and Lionel Richie, and the single was produced by Quincy Jones, who also helped put together Monday’s anniversary session.

The new single will premiere Feb. 12 on NBC during the opening ceremonies of the Winter Olympics with the hope that the download single can help funnel aid into the ravaged island nation.

Jamie Foxx plays nice with teen sensation Miley Cyrus, apologizing for his remarks on The Jay Leno Show: