It's a scary time of year to be in Hollywood!

Tons of celebs stepped out for Universal Studios Hollywood's Halloween Horror Nights over the weekend. Demi Lovato brought a bunch of pals with her, including BFF Hanna Beth, as did Dancing with the Star castmates David Arquette, Ricki Lake, Kym Johnson, Chaz Bono and Cheryl Burke.

Demi had such a great time at the amusement park that she even Tweeted about it, writing, "Just thinking about how excited I am for Halloween! Went to @HorrorNights @UniStudios this weekend and it was sooooo scary - loved it!!"

Wilmer Valderama, Elijah Wood and former One Tree Hill star Chad Michael Murray also hung out with some ghastly creatures.

But David with his old co-star, Scream's Ghostface Killer? Hands down the funniest duo of the day. Sorry, Ricki!

The event runs at Universal Studios through October 31.

Most people wash the clothes they work out in, but not Nicole Richie!

The starlet wore the exact same outfit to her Studio City gym on Wednesday (left) that she wore on Tuesday (right), down to the same red bag and the same green smoothie!

Socks, shoes, shirt, leggings, leather jacket, hair, sunglasses - SAME, SAME, SAME!

This isn't the first time Nicole has played gym-outfit-repeat. If you can spot ANYTHING different about Nicole's gym get-up, please let us know!

That comeback Lindsay so desperately needs might not happen after all!

Earlier this year, Linds booked a role in the biopic Gotti: In The Shadow Of My Father, a film about the gangster starring John Travolta and Al Pacino.

But now, filming is on the verge of being shut down, reports Deadline.

Producer Marc Fiore does not have the cash to finance the movie's production, says Deadline: " ... payments to several of the stars didn’t materialize. An expected early 2012 start date now seems unlikely."

Fiore reportedly promised actors too much money without the backing. Travolta was hired for $10 million, Pacino for $7 million -- high salaries for an indie film.

Twitter, Britney Spears

On Wednesday, Britney Spears became the sixth person in Twitter's history to hit 10 million followers.

The Femme Fatale singer had 10,143,802 at press time. She is currently on a national tour for her latest album.

Lady Gaga, Justin Bieber, President Barack Obama, Katy Perry and Kim Kardashian make up the others with more than 10 million followers.

David Arquette is getting antsy!

The Dancing with the Stars contestant couldn't keep still driving around Los Angeles on Wednesday.

The actor was smoking and playing with his iPhone, which looked like it was hooked up to his car's stereo system so he could pick out a fave tune to play next.

Earlier in the day, David Tweeted encouraging words to his DWTS co-stars, Chynna Phillips and Tony Dovolani, as the two were kicked off the show Tuesday night. He wrote, "You guys did an incredible job on the show. Thank you for your support and kindness. Love you."

So nice!

Yesterday Jennifer Garner was spotted at Tavern in Brentwood (no, she wasn't meeting with fellow diner Ashley Greene!), and the expectant actress was beaming after lunching at her fav eatery.

It was recently reported that Jen and hubby Ben Affleck are expecting a boy, and while we're sure she's thrilled about welcoming the newest addition to her family, she seems pretty excited to be taking a brief break from mommy duty!

Lady Gaga and her BFF Nicola Formichetti (who is also the Fashion Director at The Haus of Gaga) appear in a new video clip for MAC VIVA GLAM, which helps promote "passion and loving with protection," according to the company's website.

We're listening to what she has to say, but we can't take our eyes off of her hair!

Reese Witherspoon played the fun mom role on Tuesday -- she took son Deacon and his pals to California Pizza Kitchen!

The group grabbed dinner at CPK after school -- Deacon's pals were still in their polo shirts. Deacon, 7, celebrates his birthday on Oct. 23.

Reese sported the perfect mom outfit; jeans and a cute cardigan. Love it!