Always the biggest bash of the Halloween holiday, Heidi Klum played host to her annual party at Lavo in New York City on Sunday night (October 31).

The “Project Runway” beauty turned up in her towering iron-clad superhero ensemble while joined by her miniature silver-suited hubby Seal.

As for the guest list, Heidi’s devil’s day fete continues to draw out plenty of star power - with Kim Kardashian leading the pack in a sexy Little Red Riding Hood costume.

Also turning up as early arrivals for the Absolut and AOL sponsored soiree were Russell Simmons, Kelly Choi, Ice-T and Coco, with many more on the way. Check back for updates and all of the pictures as they become available!

Taking the stage overseas as she gears up for the November 16th release of her new album, Rihanna was the special guest performer on “The X-Factor” on Sunday (October 31).

The Barbadian beauty dazzled as she belted out her new single “Only Girl [In the World]” before being spotted hitting the Fountain Studios exits bundled up in a warm fur coat.

From there, Rihanna headed off for an evening on the town, as she dined at Nozomi restaurant before making her way to a nearby nightclub to cap off the Halloween holiday.

Aside from her hectic career efforts, RiRi recently spoke with press about placing emphasis on making herself happy, saying “The most important thing is to be happy and true to yourself. I don’t want to look back at this in 30 years from now and say, ‘I did it all to make them happy and I didn’t enjoy.’”

She adds, “I want to be able to say people loved me because of who I am. People have a lot more respect for you when you’re yourself and let them see your imperfections. That’s the big connection.”

Also chatting with News of the World, the 22-year-old dished on how she considers London her home, telling, “I spend more time over there [in London] than I spend in L.A., and that’s where I live. London is more like my home.”

Making the most of a rare day free from work duties, Christina Hendricks stepped out for a Halloween lunch with her parents in Los Angeles, CA on Sunday (October 31).

The “Mad Men” actress and her folks opted for a little Mexican cuisine at Paco’s restaurant, with Christina’s dad getting into the holiday spirit with some wild shades and a bright purple hat.

Clearly appreciative of her parent’s undying support over the years, Miss Hendricks recently spoke with Britain’s Grazia magazine about how her mother has taught her to embrace her curves.

She said, “I love my body as it is. People in the industry have been telling me to lose weight for years but I like the way I look. I give credit for my mother for helping me feel good about my appearance - for making sure I never felt embarrassed about my body, because she was never worried about looking too big.”

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).

Aside from doting on her little prince, Miss Kardashian took to Twitter today to encourage all those dressing as her babydaddy Scott Disick for Halloween to send in their pictures.

The 31-year-old noted that she’s anxiously awaiting shots of Disick dressed fans clad in “leopard loafers and a plaid three-piece-suit with a pocket square and a tie.”

Getting everything situated for the night’s Halloween party plans, Kim Kardashian met up with her stylist to decide which costume to wear on Sunday (October 31).

Looking fabulous in each and every option, the “Keeping Up with the Kardashians” darling swapped in and out of the various ensembles including a feline suit, Little Red Riding Hood outfit, Queen of Hearts costume and sexy pirate garb.

Unable to make up her mind, Miss Kardashian took to her Twitter page to ask for help in deciding after narrowing down the field.

The 30-year-old wrote, “Happy Halloween! I still can’t decide between 2 costumes…I will twitpic tonight! Ok the 2 options are a pirate or little red riding hood! But they are super cute and sexy! Which should I be?”

Once finished up, Kim headed off to the Prudential Center to watch the New Jersey Nets take on the Miami Heat before heading home and preparing for the Big Apple Halloween nightlife.

Drawing an end to a busy holiday weekend, Justin Bieber tended to work duties as he held a book signing at Barnes and Noble in Los Angeles, CA on Sunday (October 31).

Looking studly in an all-black ensemble complete with black-rimmed spectacles, the “Baby” hitmaker posed for pictures before sitting down to sign copies of his just-released book, Justin Bieber: First Step 2 Forever: My Story.

Tweeting about the day’s doings, Justin wrote to his millions of followers: “so far Halloween SUNDAY FUNDAY has been epic. woke up and played some ball, now off to the book signing, and then #HAPPYHALLOWEEN”

As for his new book, Justin Bieber: First Step 2 Forever: My Story is “an illustrated tome telling the behind-the-scenes story of his journey to superstardom, with the help of never-before-seen photos of the Canadian heartthrob.”

Making for a moment they’ll cherish forever, Bethenny Frankel and husband Jason Hoppy took baby Bryn out for her first Halloween on Sunday (October 31).

The family dressed up as Panda Bears and went trick or treating for a few blocks, with the former “Real Housewives” star even matching the family pooch in full costume.

Tweeting about the occasion, Miss Frankel wrote, “Ok it took a village but me,jason,dabooboo&bryn r in costume&en route to trick or treat!keep an eye out for the skinnygirl car!”

Obviously having her hands full now that she’s married with child, Bethenny later added, “Omg halloween was simple when single.I quickly turned into a hooker panda,pants falling,head covering eyes,baby crying,cookie mauling etc.”

Spending her Halloween afternoon with a little sporting action, Kim Kardashian was courtside at the Miami Heat vs New Jersey Nets game in Newark City, NJ on Sunday (October 31).

The E! reality darling was joined by a few friends including Jonathan Cheban while she tweeted prior to her Prudential Center arrival, “Heading to the New Jersey Nets- Miami Heat game! This should be fun!”

As for the on-court action, the LeBron James, Dwayne Wade, Chris Bosh trifecta proved to be too much for the Nets, as the Heat won by a score of 101-78.

Meanwhile, Kim seems to be having a tough time deciding on her costume for tonight’s Halloween festivities, as she took to her Twitter page to ask for help in deciding.

The 30-year-old wrote, “Happy Halloween! I still can’t decide between 2 costumes…I will twitpic tonight! Ok the 2 options are a pirate or little red riding hood! But they are super cute and sexy! Which should I be?”

Taking the stage for a Halloween-themed gig, Ke$ha offered up an energetic performance at the Grave Digger’s Ball in Charlotte, North Carolina on Saturday night (October 30).

Hosted by Kiss 95.1, the “TiK ToK” singer churned out the hits for the packed audience while swapping in and out of an array of spectacular costumes.

The Charlotte show comes as Ke$ha is readying for the November 22 release of a brand new EP titled “Cannibal”.

Of the effort, the 23-year-old recently told MTV, “I don’t want to go away! I feel like I’m creating this hopefully very youthful and irreverent movement of the kids, of, like, adolescence.”

Ke$ha continued, “I feel like the parents don’t get it, but the kids get it. And they deserve to have more good, positive music… It’s fun as s**t! So I wanted to give [my fans] that.”

Best known for his work as Steve Sanders on “Beverly Hills, 90210,” Ian Ziering now finds himself preparing for the most important role of his life - as he and his wife have announced that a baby’s on the way!

According to People magazine, Ian and his beautiful bride, Erin, are excitedly awaiting the arrival of a baby daughter due in April - with the child being the first for both.

Releasing a statement on the joyous news, Ziering said, “Erin and I are very excited to be parents. It’s something we both have always wanted. [Erin] is four-and-a-half months along, and we both are beyond excited.”

The baby comes after the couple were married back in May 2010, with the 46-year-old actor having been previously wed to now ex-wife Nikki Schieler Ziering.