Nick Jonas is a musician on a mission. The 18-year-old remained serious, yet stylish, while walking through LAX after arriving from Atlanta.

The sexy JoBro is currently working with brothers Joe and Kevin for the charity "Change For The Children."

Nick and the boys released the following statement about the foundation:

“We’re deeply involved in volunteering in projects around the world, supporting the Special Olympics, and raising awareness for diabetes so we can one day find a cure."

Read the rest of their statement ... after the jump.

Twitter

Nicole "Snooki" Polizzi is proudly showing off her slimmer body in this photo on Twitter. The Jersey Shore star also tweeted:

"Ready for Summaaa!!!"

The 23-year-old reality star added, "Water is my new best friend. #dieting."

Polizzi will be starring with JWoww in their own MTV spinoff show. Earlier this year, Snooki told E! News, "My number one [resolution] is definitely to keep up with my training and keep losing weight and getting toned."

Way to stay dedicated!

Find out what MTV said about her spinoff show ... after the jump.

After spending much of his week in Israel dodging paparazzi and hiding out in his hotel room, Justin Bieber finally got to visit one of the holy city's most sacred places: the Western Wall.

Wearing a hoodie, Justin snuck out after his show when he was able to do much of his sightseeing.

After his visit, Justin tweeted:

"last night after the show i was able to see Jerusalem...really incredible experience. thank you for those who helped make it happen...."

Justin briefly quit Twitter after being frustrated with the Israeli paps.

But upon his return, he tweeted nothing but love for the country. "got to see the wall and the tunnels and even a sacred bath that Jesus could of bathed in. incredible," he wrote last night, adding, "also got to visit Yad Vashem Holocaust Museum. An incredible place and something i will never ever forget."

Katherine Heigl and her mom Nancy have more in common than just genetics -- their haircuts looked eerily similar as they headed to a matinee in Pasadena yesterday.

Katherine's been focusing on her film career since leaving Grey's Anatomy, but it looks like she's finally returning to television.

Heigl will be starring and producing (along with her momager) in a new HBO film called The Knitting Circle, based on a book by the same name.

Of course, it's not really TV, it's HBO, so Heigl doesn't have to say she slummed it back to TV land!

Ashley Greene and Kellan Lutz arrived home to LA last night after wrapping work on Breaking Dawn, parts 1 and 2.

The stars, who became household names after nabbing roles as part of the Cullen clans, filmed their last scenes as Alice and Emmett in Vancouver, paused to pose for pix for fans as they headed out of LAX.

Ashley, who toted her adorable pup with her, seemed happy to be home, where she tweeted that she'll be heading to Coachella this weekend. Of course, Ashley's beau, Kings of Leon bassist Jared Followill is headlining the show tonight, so of course she'd be excited to see him!

Before hitting the stage tonight at the Gibson Amphitheatre at Universal CityWalk, Janet Jackson is stopping at Book Soup in West Hollywood to sign copies of her new book "True You: A Guide to Finding and Loving Yourself."

The fans will be going wild when Ms. Jackson arrives at 3pm!

Update: Janet has arrived! She's inside taking photos and signing books.

Miley Cyrus is feeling unwanted by her home country.

The former Hannah Montana star is about to embark on her new "Gypsy Heart Tour" which takes her to South America and and Australia on April 27, but has no dates scheduled in the US as of yet.

"I just think right now America has gotten to a place where I don't know if they want me to tour or not," she told The AP. "Right now I just want to go to the places where I am getting the most love and Australia and South America have done that for me. Kind of going to the places where I get the most love. Don't want to go anywhere where I don't feel completely comfortable with it."

With her bong-smoking scandal and her parents divorce -- and then reconciliation -- the Cyruses have been in and out of the tabloids for much of the year. But now, everything is fine, says Miley.

"My family is good," she says. "They are stoked for tour. As long as I'm happy they are happy."

Her new tour isn't the only thing Miley's taking overseas. Read which recording she's releasing down under but refuses to put out here ... after the jump.

Emma Roberts looks chic from head to toe while chatting away on her cell phone. Aunt Julia Roberts would definitely give her niece a thumbs up for this adorable ensemble.

The 20-year-old actress joins David Arquette, Courteney Cox, Neve Campbell and Hayden Panettiere in the latest Scream flick out today.

We have a feeling she'll be making a lot more phone calls on Monday after seeing the box office totals from the weekend. Scream 4 is going to kill the competition!

See more of Ms. Roberts ... after the jump.