Enjoying the momentous occasion, the Jonas Brothers were spotted out celebrating Kevin's engagement to girlfriend Danielle Deleasa at their favorite pizza parlor in Los Angeles, California on Friday night (July 3).

Joined by 30 friends, Nick and Joe smiled as they strolled out of the local eatery alongside their big brother and his lady - who got engaged this past Wednesday.

Getting an early start on her Fourth of July celebration, Audrina Patridge was spotted at The Bank nightclub at the Bellagio Resort Hotel & Casino in Las Vegas last night (July 3).

The “Hills” hottie looked excited to be partying in Sin City, sporting a white cleavage-baring dress teamed with a pair of gold strappy high heels.

Enjoying some time with his beautiful girlfriend Jessica Biel, Justin Timberlake was spotted out to dinner at Magnolia restaurant last night (July 3).

The “Cry Me a River” crooner looked stylish as he made his way through the parking lot, sporting a white button-up shirt with a pair of customized distressed black jeans and shiny black shoes following a dinner meet-up with Tom Brady and Gisele Bundchen.

Offering up a glimpse of her growing tummy, Gisele Bundchen was spotted out and about in Santa Monica on Friday afternoon (July 3).

The expecting supermodel looked cute in a floral patterned mini dress with sandals as she ran the day's errands.

Enjoying a break from her stage duties, Anne Hathaway and boyfriend Adam Shulman were spotted making their way around New York City on Friday (July 3).

Looking very much in love, the "Devil Wears Prada" actress and her beau did a bit of shopping and grabbed a lunch in the East Village - sharing a big smooch while seated at an outdoor table.

Back in the States, Mischa Barton was spotted making her way around Beverly Hills with her pet pooch Charlie on Friday afternoon (July 3).

Reportedly out for a business meeting, the former "OC" actress strolled about in a little denim outfit while enjoying the sunny summertime weather.

Prepping for a flight out of town, Whitney Houston was spotted arriving at LAX Airport in Los Angeles on Friday (July 3).

Hitting up the Delta Airlines entrance, the "I Will Always Love You" singer smiled and waved for the paparazzi before passing through security with a few travel companions including daughter Bobbi Kristina Brown.

Making for quite the action-packed day, Paris Hilton was busy continuing the filming of her reality television show "My BFF" in Dubai on Friday (July 3).

Showing off four different outfits throughout the day, the former "Simple Life" starlet kicked things of with a press op before heading off to Brummana to take a tour of the Grand Hills Hotel.

Displaying her growing baby bump, Heidi Klum tended to her motherly duties by taking Leni and Henry out to a Greenwich Village playground on Friday afternoon (July 3).

Having a marvelous time, the Victoria's Secret supermodel pushed her darling daughter on the swings before taking a breather on a nearby bench while watching her little ones play in the sandbox.

Looking in fine form following her fun-filled birthday, Lindsay Lohan was spotted leaving Samantha Ronson’s house in Los Angeles on Friday (July 3).

Wearing a black tank top with denim short-shorts, the "Mean Girls" actress offered up a big smile as she toted her trusty can of Coca-Cola while easing her way past awaiting paparazzi.