Rumer Willis headed out for Halloween in Hollywood on Saturday night.

The daughter of Demi Moore looked festive in an orange skull outfit, and responsibly hailed a cab for her and her friends at the end of the evening. Well done, Rumer!

Hollywood on Halloween weekend can be crazy. The streets are mobbed with 20-somethings in crazy -- and often, dare we say slutty -- outfits. We appreciate that young Rumer kept things classy and classic in her spooky get-up!

Celebrities let their creative sides come out at Kate Hudson's annual Halloween soiree on Saturday night!

Gwen Stefani looked grand as Cinderella (perfect for her blonde hair), and David Arquette went as Elvis. Appropriately, he Tweeted, "I think I really do have an urge for a peanut butter and banana sandwich." The actor posed for pics with actress Sara Foster (below.)

David was also accompanied by Dancing With The Stars pal Chaz Bono -- see what Chaz dressed as after the jump!

Looks like Lindsay Lohan didn't want anyone to see her sexy French maid costume Saturday night!

The actress partied in Hollywood for Halloween, where we snapped shots of her in a classic maid's outfit -- with a sexy twist.

If we may, we must say Linds' legs look amazing! Tres magnifique!

And guess who Linds was partying at the same spot with? Old pal Paris Hilton! Both were at The Roosevelt Hotel.

Linds also spent some time Tweeting back to her fans, and a few haters -- including Jimmy Fallon! See what she said to Jimmy after the jump ...

Paris Hilton was a prima ballerina for Halloween in Hollywood Saturday night -- although her evening out might not have been so demure.

Keeping more in line with her sexy, sparkly sunglasses than her tutu and tights, the heiress Tweeted, "Raging at The Roosevelt Hotel with @FarrahBritt and @HurricaneCari. Loving life! Happy #Halloween! #YES!"

Of course, never to be a one-and-done type of gal, Ms. Hilton had worn a different costume the night before. Click here to find out what it was!

And, wondering who Paris spent her Hallowee night with? Find out what guy she "raged" with after the jump!

We caught up with several celebs on Saturday as they picked up last-minute items for their Halloween costumes!

Because Halloween is on Monday, Saturday night was the time to party! Several A-listers hit up Kate Hudson's annual party in Brentwood, while Heidi Klum hosted a big bash in Las Vegas. That party was Klum's 13th annual Halloween soiree -- she'll also host a party on Monday in NYC.

Rumer Willis and Gwen Stefani both rocked casual ensembles as they shopped in Sherman Oaks and Beverly Hills, respectively. Want to know what costumes they wore? Clickhere to see Rumer's and here to see Gwen's!

On Friday afternoon Lindsay Lohan was spotted leaving the Los Angeles County Morgue following a full day of community service duties, and she appeared to be in great spirits as she skipped off to her car. We're not sure if it's because she loves the people she's working with or because she's ready to party her pants off for Halloween, but it's good to see her looking so chipper!

Hopefully all the hours of community service she's been logging will impress Judge Stephanie Sautner next Wednesday, but it seems as though Lilo has more pressing things on her mind. Last night she tweeted, "@jimmyfallon watching your show right now, mean joke about me :( & not nearly as funny as my favorite snl skit I've ever done... With you.. 'DEBBIE DOWNER' also 'Harry Potter.'" Hmm, is Lilo looking to start a new celebrity feud?

Taking a brief break from mommy duty, Jennifer Garner was spotted after a bit of pampering at the Art Luna salon in Santa Monica on Friday afternoon. Not only does her hair look amazing, but she's totally got that glow!

As you know, Jen is pregnant with her third child with hubby Ben Affleck, and it was recently reported that they are expecting a baby boy. Ben's been busy on the set of Argo and he has a few other projects in the works, but hopefully he'll have some free time on his schedule when Jen gives birth early next year...

After flying out of LAX earlier this week, Jessica Simpson returned home to Los Angeles on Friday evening with her mom Tina. Despite the fact that she was practically mobbed by a swarm of photographers, the pregnant starlet smiled and kept her cool as she exited the airport.

Jess STILL hasn't confirmed that she's pregnant with her first child, but her baby bump seems to have gotten even bigger since we saw her last, so hopefully she'll make an announcement soon! Or maybe she'll pull a J. Lo and wait until she's in the delivery room?