Lauren Conrad's Halloween With Kyle Howard

Making the most of the Halloween holiday, Lauren Conrad was spotted out and about in West Hollywood last night (October 31).

The “Sweet Little Lies” author was joined by her boyfriend Kyle Howard and a few friends as she cruised around town with an orange nose strapped to her face.

Credit: Celebrity Gossip

Stephanie Pratt: Foxy French Maid At Voyeur

Stepping out for an evening of Halloween fun, Stephanie Pratt was spotted out at Voyeur nightclub in Hollywood last night (October 31).

The former “Hills” babe looked super sexy as a flirty French maid named ‘Miss Deelightful’ as she chatted away on her mobile phone.

This year’s racy outfit is a first for Miss Pratt, who told press she usually goes for the more horrific side of the holiday.

"I'm always something dead. I've never been sexy, which is weird. The easiest is just to put on fake blood and put on some fangs and be something dead. You could be a dead schoolgirl, a dead cop — anything."

Credit: Celebrity Gossip

Christina Aguilera: Arresting Halloween Costume

Showing off her dominant disposition, Christina Aguilera was spotted out in Hollywood dressed as a female police officer last night (October 31).

The “Ain’t No Other Man” songstress looked fabulous as she made her exit from the Pandora Halloween Party to find paparazzi waiting for her.

Credit: Celebrity Gossip

Heidi: I've Had "Ups and Downs" With My Body

Reunited spouses Heidi Montag and Spencer Pratt packed on the PDA in Las Vegas on Saturday, where Montag, 24, hosted Pure nightclub's Halloween Haunt. Pratt, 26, dressed as a Close-Encounters-style alien; Montag skipped a costume, but showed off her surgically-enhanced curves in a gold mini-dress.

"I'm Heidi Montag for Halloween," she told reporters on the red carpet. "I designed my own dress."

How does Montag feel about her body (she famously had 10 procedures done in one day) these days? "Um, ups and downs!" she said. "I'm good. I'm just trying to focus on other things, not focus so much on my body."

A lot has happened since then. The Hills, the MTV reality show that made them stars, aired its final episode. And over the summer, the pair (who married in April 2009) separated, filed for divorce and then reunited.

Montag gushed on the red carpet that, this time around, she's "enjoying our relationship. I had so much going on [before, I didn't have a chance to enjoy being a newlywed."

One thing that's definitely real: Montag's sad isolation from most of her friends and family. Her mom Darlene Egelhoff hasn't seen her daughter in nine months, and is now working as a maid in Crested Butte, Colo. to make ends meet.

Egelhoff -- who loudly objected to Heidi's surgery and her husband Pratt -- admitted to Inside Edition that it's awkward when folks now recognize her from The Hills.

"That's very humbling for me and I very much appreciate that experience because I don’t ever want to get full of myself and think I’m too good to do anything."

Credit: Us Magazine

Kim Kardashian At Heidi Klum's Halloween Party

Kim Kardashian, as Little Red Riding Hood, attended Heidi Klum's 11th Annual Halloween Party at Lavo in New York City, NY. Also pictured, her big bad wolf: Jonathan Cheban.

Credit: Zimbio

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Does AnnaLynne McCord Have A New Man?

AnnaLynne McCord looks like she may have snagged herself a new man.

The 90210 star was far from shy with model Aaron O'Connell Saturday while hosting a party at Lavo Las Vegas, walking into the club hand in hand and never leaving each other's sides.

Inside, McCord and O'Connell were seen flirting with each other in their VIP section, taking pictures together on their personal cameras and drinking Veuve Clicquot champagne. Later, she was spotted sitting on his lap.

"They were all over each other," an observer tells PEOPLE. "There were definitely not trying to hide anything. They were dancing all over each other and didn't separate."

Dressed as the White Queen from Alice in Wonderland, McCord could also be seen wearing O'Connell's hat, an accessory to his pilot costume.

Earlier this month, McCord, who told Ryan Seacrest in September she was "very with" Twilight hunk Kelan Lutz, and O'Connell were at a benefit in Los Angeles for The Homes That Hollywood Built, a benefit for the St. Bernard Project which helps supply housing for those who lost homes in Hurricane Katrina.

A rep for McCord did not immediately respond for a request for comment.

Credit: People

Kourtney Kardashian and Mason: Trick-or-Treat!

Certainly an occasion in which she'll never forget, Kourtney Kardashian took her adorable son Mason out for his very first Halloween trick-or-treating expedition.

Dressed as a pirate, the E! reality cutie toted her frog-suit sporting 10-month-old in her arms as they roamed the streets of New York City in search of candy handouts on Sunday evening (October 31).

Credit: Celebrity Gossip