Who is American Authors?

The 2015 Sundance Film Festival is in full swing, and it's drawing some of the biggest names in entertainment and show business to Park City, Utah. This is a historic year for the festival, as it marks 30 years for the festival that launched hundreds of independent films and gave new filmmakers, directors and artists a venue to share their work.

At GOBankingRates, we were curious (as we always are) to get a peak at what's going on in the wallets of those who work in film and music. We caught up with Brittany Snow in Park City where she hosted a VIP event with a live performance by American Authors to celebrate the launch of Lipton's new Sparkling Iced Tea. To get the inside scoop on what Snow and the American Authors bandmates keep in their wallets, we asked them two questions:

1. What's always in your wallet or purse (aside from your ID), and why can't you leave home without it?
2. What would you never carry in your wallet/purse and why?

What Brittany Snow Always Keeps in Her Wallet and Purse

Brittany Snow is best known for her starring role in the 2012 hit movie "Pitch Perfect, " which grossed over $113 million in worldwide box office sales and became one of the highest-grossing musical comedies of all time. Luckily for fans of Snow and "Pitch Perfect, " the actress is reprising her role as Chloe for the sequel "Pitch Perfect 2, " which is set to release on May 15. Thanks to her talent and the success of "Pitch Perfect" and other work, Brittany Snow's net worth is estimated to be $7.5 million by CelebrityNetWorth.

When it comes to her wallet, Snow said there are some things she just can't seem to clear out.

"In my wallet I have a lot of gift certificates that I never use, " Snow said. "People give me certificates all the time and it's like the best thing for the companies because I just forget to use them."

Snow's not the only one. MarketWatch predicted Americans would leave $750 million in gift cards unclaimed in 2014.

Snow looked chic in a long-sleeve, knee-length black dress that featured a collar with white strip detail. She completed the look with a bright red lip, which was fitting as Snow told GOBankingRates she's never without lipstick.

"I'm a big chapstick, lipstick person, " Snow said. "I love lipstick, I just collect lipsticks but never use them!"

But there's at least one thing Snow wouldn't be willing to carry around in her purse: "My dog. People who carry their dogs in their purse frighten me! My dog would be out of there in two seconds."

What the Band Members of American Authors Keep in Their Wallets

American Authors consists of lead singer Zac Barnett, lead guitarist James Shelley, bassist Dave Rublin and drummer Matt Sanchez. The band made a huge splash with its mega-hit "Best Day of My Life" from the 2013 debut album "Oh, What a Life." American Authors sold millions of copies of the album and "Best Day of My Life" hit two-times double-platinum in July 2014, which is great news for the band members' finances. The song also snagged the No. 1 spot on Billboard's list of Adult Pop Songs of 2014, and has been featured in a range of TV shows and commercials.

American Authors' success brought some huge performance opportunities, including the 2014 Macy's Thanksgiving Day Parade and Nickelodeon Kids Choice Awards 2014, along with appearances on talk shows like "The Ellen DeGeneres Show" and "The Tonight Show with Jay Leno."

So what's in a hit musician's wallet? Pretty much exactly what you'd expect: "Guitar picks, because you never know when you're going to have to play, " said Barnett. "That's pretty much it, though - never cash, only guitar picks."

Some of Barnett's American Authors bandmates do keep cash in their wallets, but we're still not sure it'd be very useful to them. "Interestingly enough - foreign money, from when we travel to different countries, " Sanchez said. "It's always in my wallet now."

When asked what you'd never find in his wallet, bassist Rublin joked, "My ID!"

Barnett actually agreed: "Yeah, I would never put Dave's ID in my wallet either." Rublin must lose his ID pretty often because Barnett added, "So Dave, next time you lose your ID, it's not in my wallet, dude."