Taylor Swift Was the Biggest Star of 2015, According to 'Good Morning America' Fans

— -- 2015 was a big year for celebrities.

However, some stars had bigger years than others.

When asked whether Taylor Swift, Adele, Tracy Morgan or Caitlyn Jenner ruled 2015, the "Good Morning America" fans agreed that the honor belonged to Taylor Swift.

"Adele's year is 2016, while @taylorswift13 had one of the biggest world tours in 2015," wrote in @brianolivia. "So the whole year needs to go to Taylor."

"Adele of December maybe, but not 2015! That has to be Taylor surely," added @alltoogeorgia.

Here's what made each celebrity a contender for the title.

Taylor Swift

Last year was huge for Taylor Swift, as she officially transitioned from country music to pop with the release of her multi-platinum album, "1989." Somehow, however, 2015 proved to be even more exciting. In May, the 26-year-old superstar kicked off her "1989" world tour in Tokyo before returning to the U.S., where, over the next few months, she brought the likes of Justin Timberlake, Julia Roberts and the U.S. Women's World Cup soccer team on stage with her. Big, yes, but her busy summer was just beginning. In June, she penned an open letter to Apple and convinced the tech giant to change its policies toward musicians. In July, she threw a blow-out July 4th party, attended by Gigi Hadid, Joe Jonas, Ed Sheeran, and yes, her new boyfriend, deejay Calvin Harris. Then, in August, the singer won three MTV Video Music Awards, including the biggest award of the night, Video of the Year. (Viewers of the show are equally as likely to remember her much-discussed performance with Nicki Minaj as her armload of Moon Men.) Rounding out the year, Swift picked up six Grammy nominations and then treated her "1989" world tour crew to a relaxing Australian vacation. Not too shabby. It's no wonder 62 percent of you thought that 2015 was the year of Taylor Swift.

Adele

Expectations for Adele's third album, "25," were so huge that it seemed impossible for the singer to meet them. She did. Surpassed them, even. After the single "Hello" dropped in late October, the singer's album crushed records within days of its November release. "25" has sold more than seven million copies and is the first album ever to sell one million copies in two consecutive weeks. (It's done so for three.) "It’s a bit ridiculous,” the singer told Time magazine of the album's success. "Maybe they think I’m related to the Queen. Americans are obsessed with the royal family.” And with Adele. When tickets to her 2016 world tour went on sale on Dec. 17, fans were outraged when they sold out in minutes. So, who knows? If this was the year of Taylor Swift, will Adele be her successor?

Caitlyn Jenner

In April, Olympic champ Bruce Jenner spoke to ABC's Diane Sawyer and made a statement that stunned the world: “For all intents and purposes, I’m a woman." Then, a few weeks later, she revealed her new look and her new name - Caitlyn - on the cover of Vanity Fair magazine. "Bruce always had to tell a lie. He was always living that lie," she told the magazine. "Caitlyn doesn’t have any secrets. Soon as the Vanity Fair cover comes out, I’m free." She was. One month later, with her children and former stepchildren in attendance, she accepted the Arthur Ashe Award for Courage at the ESPYs, where she thanked her fans for their support. “This transition has been harder on me than anything I could imagine. And that’s the case for so many others besides me," she said. "For that reason alone, trans people deserve something vital. They deserve your respect. And from that respect comes a more compassionate community, a more empathetic society and a better world for all of us."

Tracy Morgan

At the end of 2014, Tracy Morgan said that he was "fighting every day" to recover from injuries he sustained in the June 2014 car accident that claimed the life of his friend, comedian James McNair. This year, he proved just how determined he really was. This past June, Morgan said he was "at 75 percent," but by August, the formerly wheelchair-bound comedian was walking down the aisle to marry his longtime girlfriend, Megan Wollover. "Megan was by my side throughout all of the hard times of this past year," he told People magazine at the time. "She is my rock." After that, he was back in the spotlight, taking the stage at the Emmy Awards and guest-hosting "Saturday Night Live." "I survived that crash for a reason. I'm still here for a reason. I guess my room wasn't ready," Morgan told Barbara Walters recently. "Who knows? Maybe he kept me here to raise my daughter, to raise my family."