Americans will spend nearly $3 billion on Halloween costumes this year, and the majority of them will dress as witches, vampires, princesses and other traditional Halloween attire. 

The National Retail Federation’s 2012 Top Halloween Costumes survey reports 10 percent  National Retail Federationof kids plan to dress as a princess, while six million adults plan to go as a witch.

Batman is the second most popular Halloween costume for kids, while the character — along with other characters from The Dark Knight Rises — is fourth for adults. 

Some people plan to turn to current events as inspiration for their Halloween costume, whether it’s an athlete, political figure or something else entirely.

Read More: Find Out How Much Crystal Lake, Cary and Fox River Grove Spent on Adult Halloween Costumes Last Year.

“With nearly one in ten celebrants taking their costume cues from current events, we’ll see plenty of Barack Obama and Mitt Romney look-alikes out-and-about for Halloween,” said Pam Goodfellow, a director at the survey firm BIGinsight. “However, we expect these ‘rivals’ will be able to find some common ground over the punch bowl or a bag of candy.”

Sesame Street's Big Bird costumes may also see a resurgence this season due to the first 2012 Presidential Debate, where Republican presidential candidate Mitt Romney suggested decreasing funding for the PBS.

And some media outlets predict South Korean rapper Psy, recently thrust into the spotlight after his dance video "Gagnam Style" went viral on the Intenet, will inspire costumes for Halloween parties this year.

Pets also play a big part in the holiday, as owners are expected to spend $370 million on outfits for the pets. The most popular Halloween costumes in that category are pumpkins, devils and hot dogs.

The full list from the National Retail Federation