Of course we get the real dirt a few days after the big night. Apparently, Mariah Carey and Rihanna had a diva-off on Halloween. Even though Mariah was hosting the party, Rihanna didn’t pay her regards to the songstress, a witness said. And Rihanna’s tiger costume required a security guard to hold up the tail, while Mariah needed six guards to clear a path to the bathroom so her angel wings didn’t get tousled. Sheesh. [NY Post]

What is it about Halloween that brings out the stars’ most ridiculous behavior? Read on for more celebrities who behaved badly on Halloween.

• Model Kimbra showed up at 1st Annual Guggenheim Art Awards last night dressed as what many think was intended to be a blue vagina. And no, it wasn’t a costume party. [Jezebel]
• Steve Madden is starting a clothing line this spring. We can only hope it’s a classy as these leopard bow pumps. [Second City Style]
• You can’t spend a couple grand on Alexander Wang’s upcoming Rocco bag even if you want to. Barney’s New York already has a 400 person waiting list.
• Michael Kors is following in Burberry’s footsteps and doing color cosmetics now, too. [Beauty Counter Blog/Style.com]

• Halloween means spooky, spooky ghosts are lurking, so check out what you see in the above video. [Urlesque]—Scary crying ghosts girl or figment of the collective imagination?

We were so focused on the crappy Cyrus parents who let their 9-year-old daughter out of the house dressed like a sexy witch in dominatrix boots, we forgot about scads of other crappy American parents who fret about their sons playing dress-up on Halloween. Oh, The Onion, you crack us up!

I love Halloween. I want to believe that everyone loves Halloween—like it’s a universal Tim Burton-style Christmas—and that we all come together, unified, for the sake of weirdness and costumes, zombies, vampires, princesses, and gore. I’m torn, though, on whether I love it enough to take Vogue‘s costume suggestions. For the haute couture undead look that’s all the rage, they suggest booking a professional stylist. The people of MAC, Sephora, Nars, or Henri Bendel will make you fabulous for a price. Some of these ghastly makeovers run over $200. I didn’t even spend that much for my wedding up-do! Silly and frivolous or the expensive style solution for the biggest dress-up day of the year? What’s a ghoul to do?

Today, all the morning shows did their homages to Halloween, including “The Today Show,” where Al Roker and company got all “Star Wars” and mistakenly invited some unruly ewoks to the party. Are the ewoks drunk, sober? Children, midgets? Kidding, out of control? Whatever the heck went down, it made for some amusing TV. [Buzzfeed]

Everyone loves pin-up girls. Those saucy, knowing stares, the pretty curls and red lipstick, all the oozing sores and blood. Described as Gil Elvgren meets “Night of the Living Dead,” you can’t go wrong gifting this 2010 calendar to horror film junkie friends. Also, at $14.99, it costs just slightly more than one movie ticket. Order here and check out a few more gorgeous, deadly dames after the jump!

Halloween is the perfect time for a little gender-bending. And Sherlock Holmes is one of the best fictional detectives making a resurgence this year with a new movie, so why not combine the two for your costume? All you need are a few classic menswear pieces that can be pilfered from your dad’s closet, thrifted, or purchased (details after the jump).

When Heidi Montag and Spencer Pratt dress up as Jon and Kate Gosselin for Halloween, an angel bursts into flames. [Los Angeles, 10/29/09]

A few years ago, a vaguely goth friend of mine got engaged to her boyfriend, who is so gothtastic that his name might as well be Azrael. The two of them planned a pretty non-traditional wedding—they wanted to fly to Transylvania and get hitched in a haunted castle. But when they told their parents this, their plans got the kabosh. They ended up getting married in Ohio, instead. Today, I saw another story about a spooky wedding dream that got the smackdown. Lisa Panensky and Jim Nieves have been planning their wedding for over a year. They signed a contract to exchange their vows in the Old Dutch Church in Sleepy Hollow, NY, which you may remember from Washington Irving’s creepy tale, The Legend of Sleepy Hollow. But when the reverend heard this week that they planned to play the theme song from “The Munsters” during their ceremony and that they were going to wear costumes, he canceled their wedding and sent them a refund. What a party pooper. What’s a Halloween-loving couple to do? [AOL]

While I hate Christmas music, I heart Halloween jams like “Monster Mash.” Thanks to purveyors of fine whatnot, OrientalTrading.com, I made my own music video to the classic track using the creepiest photos I could find of my Frisky friends. It’s the freakiest, funniest masterpiece I’ve posted to my Facebook page since those drunken vacation photos! If you wanna do the mash with us, just go here or you can DIY your own personal monster musical at MonsterMashUp.com.

Need a little last-minute extra inspiration for your Halloween costuming? Pipeline has exactly what you need with all the spookiest style looks hot off the haute couture runways. If you’re tired of the usual costume options, these over-the-top looks not meant for All Hallow’s Eve may get your creative juices flowing. Whether your alter ego is a witch, a zombie, or a clown, you’ll look damn good doing it like these ghoulish gals. [Pipeline]