Kristen Bell is officially off the market! She has agreed to marry her long-time boyfriend, When in Rome co-star Dax Shepard. According to her spokesperson: "Yes, they are engaged. Over the holidays." So, what has kept this couple going strong for so long? "I've learned the necessity for healthy communication," says Kristen, who provides the voice of the narrator on Gossip Girl. "How important it is to talk about your deepest, darkest fears and feelings," she adds. No word on when exactly Kristen and Dax are planning to walk down the aisle.

International fashion model, actress Kiera Chaplin, granddaughter of Charlie Chaplin, just received the Global Cocktail Chilled music CD that is included within The Loungescape Kit from the band Porkpie as an early Valentine’s Day gift.

Proud papa Matthew McConaughey posted a picture of the baby girl that his girlfriend Camila Alves gave birth to on January 3. Matthew and Camila named their brand-new daughter Vida. "We are both truly honored to welcome this little lady into our family," Matthew wrote on his blog shortly after her birth. Little Vida has an 18-month-old big brother, Levi.

- Cheryl Burke drank Monster at the Smashbox Party in the Tweet House during the Sundance Film Festival on January 23.

- Orlando Bloom convinced co-star Mark Ruffalo to hit the slopes at the Oakley “Learn to Ride Snowboard” event at Sundance on January 24.

- Ryan Gosling and Michelle Williams took turns sledding on inner tubes with friends at the "Blue Valentine" Party in the T-Mobile myTouch Diner at Village at the Yard on January 24.

It seems as if just about everyone has an opinion on Jay vs. Conan, so it was only a matter of time before Joan Rivers contributed her two cents. Joan, who had a brief but tumultuous stint hosting her own late-night talk show on Fox in the 1980s, offered her thoughts to Vanity Fair magazine while at the Sundance Film Festival promoting a documentary about her life, A Piece of Work. The always-opinionated diva says of Jay Leno, “I think people got a good look at him and realized he ain’t funny!” But don’t count Joan on Team Coco just yet. She quipped that Conan O'Brien getting dumped by NBC was the “luckiest thing that ever happened to him. He would have ended up a failure and let go. He’s walked away with $40 million — not tragic!” In a controversial decision by NBC, Conan's stint as the host of The Tonight Show ended on January 22, while Jay is ready to take back the reins on March 1.

Leonardo DiCaprio, Edward Norton, Chace Crawford, Jason Bateman and other stars have united to a film a web-based video campaign urging Congress to pass the first-ever climate and clean-energy bill. The video, called “This Is Our Moment,” was made by the NRDC Action Fund — and Leo is a trustee. To watch your favorite actors try to save the planet, visit www.thisisourmoment.org.

A year and a half ago, Christina Applegate announced she'd been diagnosed with breast cancer and had undergone a double mastectomy. Now, the Emmy-winning actress, 38, is stronger than ever and has a brand-new outlook on life. “You look at life a little bit differently,” Christina told In Touch while being honored at the EIF’s Women’s Cancer Research Fund event on January 27. “You don’t let any stress into your life, and you do a total 180 from where you were.” Christina, who has been dedicating a lot of her time to promoting awareness about the disease, admits that she has plenty of things to accomplish in the future. “I want to work with Meryl Streep, I want to go to Greece, and I may want to jump out of a plane,” she said. “And babies, lots of babies. Well, not lots of babies, but a couple!”

When you look like model Camila Alves, it must be difficult for your man to keep his hands to himself! But the Brazilian bombshell and boyfriend Matthew McConaughey won't be getting hot and heavy until their infant daughter, Vida, is 40 days old. According to Camila, it’s a tradition in her home country to abstain from sex and other strenuous activities for 40 days after birth to allow the mother’s body to relax. “You give it time to recover and let everything settle down. For these 40 days you really take it easy,” she told stylelist.com. Surprisingly, the sex isn’t what Camila misses most! “I confess, I am getting a little anxious to workout. I miss it,” she added. Fortunately for Matthew, it looks like he will get lucky on Valentine's Day — the fast is over on February 13! Check out Camila as the new host of Bravo’s Shear Genius, which premieres on February 3 at 10 p.m. ET.

They may have had a tough year, but John Travolta and Kelly Preston have proved that their love can weather any storm. The couple, who have been married 18 years, spilled their secret for a strong union. “Communication!” John, with his wife by his side, told In Touch when asked about the key to a successful marriage at the New York premiere of his new film, From Paris With Love, on January 28. Years later, Kelly can still happily recall the moment John asked for her hand in Switzerland. “He had gotten the ring and did it at the stroke of midnight. That was very romantic!” she gushed. The big-hearted lovebirds, who will celebrate a sweet Valentine’s Day with chocolate treats, recently assisted the earthquake relief efforts in Haiti. Despite their seemingly perfect partnership, the pair are hardly living a fairy tale — their 16-year-old son, Jett, died suddenly of a seizure in January 2009. Adding to the nightmare, John and Kelly have been dealing with the aftermath of an extortion attempt related to the tragedy.

Tracy Morgan and a doorman practice shadow-boxing behind the scenes of Volkswagen’s new “Punch Dub” Super Bowl ad that debuts next week.