We haven't seen Lindsay Lohan and Katy Perry party together before, but we're lovin' it! Throw in James Deen, the porn star ... and we're talkin' a sexy threesome. Deen will be starring with Linds in the upcoming flick, The Canyons.

The 26-year-old redhead hit the Shore Bar to celebrate the 4th with the "Firework" singer. Lilo, as usual, gave good face to the cameras on her way out, but Katy ... not so much. Even though she was dressed in red, white and blue from head to toe, Russell Brands' ex tried to stay under the radar.

Perry had performed in New York earlier in the night ... even hiring strippers for the NYC bash. But after a quick 5-hour flight, she finished up the holiday at the Santa Monica bar.

As for Lilo, her porn buddy picked her up at 2:30am, and the two headed to the Casa Del Mar hotel for some after-hours fun.

Perhaps Linds saw some fireworks, afterall!

Britney Spears and fiance Jason Trawick are enjoying a well-deserved vacation in Hawaii with Brit's beautiful two sons, Preston, 6, and Jayden, 5.

The mommy of two Tweeted the above photo and the following, "Happy 4th of July from the Aloha State."

Spears, 30, is currently a judge on the X Factor ... and seems to be lovin' her co-workers. We can't wait to watch our girl on the upcoming season!

Deciding to have an intimate 4th of July Celebration on the beach, Christina Aguilera clutched a beverage as she strolled hand in hand with beau Matthew Rutler in Malibu, while her adorable son Max played in the sand nearby.

The 31-year-old singer got into the patriotic spirit by wearing a cute American flag shall over a white tank and spandex pants, while Matt kept it casual in a black tee and tie-died yoga pants.

Later in the day, Xtina's beau was having a blast playing with her 4-year-old in the ocean, lifting him up in the air, throwing a ball around with hims and dodging the waves. After just one-year of dating, Matt seems to fit into Aguilera's family just perfectly!

She may be facing some harsh criticism lately for not dropping the baby weight stat, but we think Hilary Duff looks drop dead gorgeous at any size!

The former Disney star wore jeans and a bright yellow top that perfectly accentuated her sexy new curves as she headed to a 4th of July BBQ with hubby Mike Comrie in Studio City, on Wednesday afternoon.

Duff recently lashed out at critics who commented on her post-baby curves, telling In Touch mag: "I'm not perfect, but I feel fantastic. I don't care what people say. I'm not back to where I want to be, but I'm not stressing it."

Getting into the patriotic spirit on Independence Day, Brazilian-born model Alessandra Ambrosio looked stunning in a red sweater with white stars, as she spent the afternoon in Malibu with beau Jamie Mazur and their adorable kids.

The Victoria’s Secret model gave birth to baby Noah Phoenix in May, but she's already bounced back to her post baby weight, and recently shot the latest campaign for Brazilian fashion line Colcci with Ashton Kutcher, wearing next-to-nothing!

It's no surprise Ambrosio famously walked the runway for Victoria's Secret Fashion Show just three months after giving birth to her first child, Anja, in 2008. She is a world famous supermodel, after all!

They just tied the knot a few short weeks ago, but now Matthew McConaughey and his wife, Camila Alves are expecting baby No. 3!

The Magic Mike star shared the happy news via Twitter on Independence Day, revealing:

"Happy birthday America, more good news. Camila and I are expecting our 3rd child, God bless, just keep livin."

The newlyweds already have two children together, Levi, 3, and Vida, 2, who acted as a ring bearer and flower girl during the June 10 nuptials at the couple's ranch in Austin, Texas.

Congrats!

Happy Fourth of July Violet and Seraphina!

Ben Affleck and Jennifer Garner took their two daughters to a holiday parade in the Pacific Palisades today, and the adorable foursome looked like the picture of an all-American family! The Argo actor snapped pictures of the festivities, while the brunette actress looked on with a smile.

Seraphina was dressed for the occasion in bright blue tennis shoes and a blue striped dress, and the little one even showed her patriotic side with adorable American flag bows in her hair.

The A-list Hollywood couple blended in with the crowd, looking like just another family enjoying cotton candy and fireworks. We would never see Brad and Angelina out in public without their bodyguards!

Miley Cyrus and Ashley Tisdale are in the Fourth of July spirit! These all American girls posted festive Twitpics in honor of the holiday.

While Miley's hangin' with fiance Liam Hemsworth in LA, Ashley jetted out of LA yesterday after her Malibu Beach birthday party, and touched down in Iowa where she's taking in the small-town sites, included a 4th of July parade featuring locals on tractors! #AmericasHeartland!