Two of music's most colorful performers are teaming up for an ad campaign for MAC cosmetics' AIDS Fund.

Lady Gaga and Cyndi Lauper will appear in MAC's new Viva Glam advertisements and are lending their names to new lipsticks. The Viva Glam line, which was started in 1994 and has already raised $150 million, donates every dollar of its sales to help men, women and children affected by HIV/AIDS.
"We want to make this trendy and fun," Gaga, 23, told Women's Wear Daily. "We don’t want this discussion of AIDS to become this overly intellectual discussion, because we need to make discussions about AIDS really normal -- not sitting in school nodding off because your teacher’s handed you some sheet that’s like all these percentages and graphs, and you’re thinking, well, she probably hasn’t had sex in 15 years. Sex education should be bright and vibrant and every woman should want to have this in her purse."
(In fact, one ad reads, "You know you've got a sexy voice. Use it! Let's talk about how to keep your love life safer, seductive and satisfying. Just between us girls!")

The bubble-gum pink Viva Glam Gaga and the coral red Viva Glam Cyndi lipsticks will be available on March 18 and will cost $14, according to WWD.

The two blonde singers -- who join a long list of stars who have worked on the Viva Glam campaign, including Fergie, Christina Aguilera, Eve, Mary J. Blige and Lil' Kim -- hit it off at their recent photo shoot for the "From Our Lips" ads in New York City.
"We lucked out," Lauper, 56, said, adding that in the '80s, she put lipstick everywhere -- not just on her lips. "When we met each other, we liked each other and are interested in the same type of things. We laugh about similar things."

Both stars are expected to make personal appearances on behalf of the initiative, and the ads will appear in magazines later this month.

Kristen Stewart is pretty, that's for sure.

But her makeup artist, Robin Mathews, says The Runaways star, 19, is more than just a pretty face.

"She's the most chameleon-like actress that I’ve ever witnessed," Mathews tells Nylon magazine. "She can play a beauty or a wreck at the same time if she wants to... She just has a bone structure that allows her to be morphed into other things easily."
Still, that didn't mean it was easy for Stewart to turn into Joan Jett -- and for Dakota Fanning to become Cherie Currie -- for the recently released biopic.

"For The Runaways, we had binders in the makeup trailer with about 5,000 photos total, and then I lined the entire trailer with tons of photos of Cherie Currie and Joan Jett," Mathews says. "It was really important to get them to look as close to the real characters as possible, which meant doing a lot of chiseling."
Mathews -- who has also worked on the second and third installments of the Twilight movie franchise --even admits that she used "some prosthetic appliances" to complete Stewart's transformation.

The makeup pro also admitted that Kristen's turn as Bella in Twilight and New Moon was "tricky" because she "had to be a naturally pretty girl" surrounded by mythical vampires.
"She needs to be plain but beautiful at the same time," she says. "It’s all about the flawless skin and a naturally pretty cheek color."

Which was harder -- Joan Jett or Bella Swan?

The Runaways, she says, adding that it's difficult "recreating real people, icons."

On Tuesday morning, the Beyonce Knowles -- typically one of the world's most glamorous, decked-out stars -- rolled out of bed in Rio de Janeiro and waved sweetly to fans from her hotel balcony.

Who says you can't go home again?

More than three years after Tom Cruise was unceremoniously ushered off the Paramount Pictures lot, the not-so-controversial-anymore movie star is reteaming with the studio for a fourth Mission: Impossible film, Cruise's rep confirms to E! News.

The 47-year-old family man will be reprising the role of Ethan Hunt, secret agent extraordinaire, in the latest sequel, set to start shooting this summer in time for a release around Memorial Day 2011.

There's no director yet, but Josh Appelbaum and André Nemec have been tapped to write the script.

Mission: Impossible III director J.J. Abrams, no longer a gamble as far as feature-filmdom goes thanks to Star Trek, will coproduce along with Cruise.

MI3 did respectable but underwhelming business at the box office, prompting Viacom chairman Sumner Redstone to terminate Cruise's production deal at Paramount in August 2006, citing Cruise's ginormous paycheck for MI3 and some of his more questionable behavior at the time as part of the problem.

But a billion adorable pictures of Suri Cruise later...

"Tom and J.J. are great talents and we are excited to be working with them to relaunch this legendary franchise," Paramount chairman and CEO Brad Grey said in a statement Tuesday.

The quest to determine whether Beyoncé has a half-brother is picking up steam.

The Grammy-winning diva's dad, Matthew Knowles, who was a target of a paternity suit in October, exclusively tells E! News that he will "certainly" submit to a paternity test when asked.

"I know about as much as you do," he says. "Last week, they said it was a girl; this week they said it was a boy. We do have a court date, but none of that means anything until DNA testing is done.

"I'll leave that in the hands of the attorneys," Knowles adds.

Alexsandra Wright, who claims that Knowles fathered her child during an affair that lasted 18 months, gave birth to a son last week. A source told E! she's planning to request that the former Destiny's Child manager take a DNA test, and then, if it's positive, will petition Knowles for child support.

Knowles has denied being Wright's baby daddy and has not offered up any money to date, our source says.

Beyoncé's mother, Tina, filed for divorce from Matthew in December after 29 years of marriage.

—Additional reporting by Lindsay Miller

Are Paris Hilton and Doug Reinhardt secretly engaged?

The hotel heiress has made no secret about wanting to marry the former Hills regular, but she took it to another level this past weekend while accepting an award for her charity work...

"I'd like to thank my future sister-in-law Casey [Reinhardt]," we're told Ms. Hilton said from the podium at the Hearts for Hope benefit in L.A.

Doug wasn't at the event, but both his sister and mom were, and they were sitting at Hilton's table.

If Doug does propose to Paris, perhaps he can take some pointers from his mom. "At one point, Paris reached for Doug's mom's huge wedding ring," says an eyewitness. "She looked like she was in awe."

And get this, the Reinhardts are such big fans of Paris, they'll even pay to hang out with her! "Paris auctioned off a party picnic at her house for charity, and the bidding went all the way up to $6,000," says our source. "Even though Casey can obviously party at Paris' house anytime for free, she went ahead and took the final bid."

In May, Paris gushed to our Hollywood Party Girl, "[Doug's] gonna be my future husband!"

Sounds like they could be picking out china patterns any day now.