Britany is a Witch for Halloween

Britney Spears dresses up as a witch and takes her two sons — Sean Preston, 3, and Jayden James, 2 — for a round of trick-or-treating on Halloween.

Just posted on her official website, the 26-year-old pop princess posted pics of her boys, gal pals Courtney and Laura Lynn, her assistant Brett and dad Jamie. Looks like they all had a blast dressing up together!

Brit also revealed she attended Drew Barrymore’s Halloween party

The Best and Worst Halloween Costumes

Paris, Kim Kardashian, Heidi Klum, Britany, Pink, Katy Perry

Katy Perry's Birthday / Halloween Party

Well, the spooky holiday coincides with Katy's birthday (she turned 24 on October 25); so the singer threw a massive Halloween/birthday bash at Siren Studios in Los Angeles Tuesday night, reports E! Online.

Setting the tone for the event, so-gay Katy arrived at the festivities in a hearse.

More than 200 costumed guests—including Josh Groban and Cisco Adler—packed into the Malibu Rum-sponsored event to creep each other out with their costumes.

Aside from guzzling rum concoctions, partygoers bobbed for body parts and made merry in a coffin photo booth and an execution chamber.

Guests were asked to dress as their favorite dead celebrity. Adorned with a bushy mustache, Katy resurrected deceased Queen frontman Freddie Mercury.

How the Celebs Halloweened

JONAS BROTHERS

"We did a Harvest Party at our church and the kids could dress up as a positive character," mom Denise Jonas says of this pic from Halloween 1998. "Joseph was Grandpa Grape from Veggie Tales. Nicholas was Blue from Blue's Clues and Kevin, I created that costume out of the pieces, he was the game Operation."

LAUREN CONRAD

"I really liked the costume," says the Hills star, here, at age 8. "I must admit though, I was not a very scary witch."

NICOLE SCHERZINGER

She was only 9 when the Pussycat Doll put together this outfit. "I loved dressing up as Carmen Miranda," says Scherzinger. "The costume was such a production, especially the fruit on my head. But I always won every costume contest I entered in this!"

MARIA MENOUNOS

"Baby was my very first dog who was sick and dying at a pet store before I bought and rescued her," says Menounos, here as a teenage Dorothy. "She was the perfect Toto!"

ASHANTI

"When I was younger, I loved Halloween!" says the Resident Evil: Extinction actress, here at age 7 as a flapper. "I would rush home from school and do my homework as quickly as possible so I could go trick-or-treating with my friends."