The "ARTPOP" singer brought along a costume horse while Joan Jett, 2 Chainz, Jordin Sparks, Ke$ha and One Direction were also among attendees at the Nokia Theater on Sunday.
Pop singer Katy Perry kicked off the awards show with a performance of "Unconditional."
Lady Gaga and the accompanying costume horse made its way around the red carpet on Sunday.
Taylor Swift, who won artist of the year at the American Music Awards, posed on the red carpet.
Rapper 2 Chainz poses on the red carpet at the American Music Awards.
Singer Christina Aguilera was among the attendees at the ceremony on Sunday.
Singer and actress Jennifer Hudson, an American Idol alum who recently earned a star on the Hollywood Walk of Fame, was among the attendees at the event.
Artist Joan Jett is seen with a slight smile on the red carpet prior to the American Music Awards.
Actress Alicia Silverstone smiled as she arrived at the Nokia Theatre on Sunday.
Akon, a presenter at the American Music Awards, was seen on the red carpet.
Singer-songwriter Ariana Grande is seen on the red carpet at the American Music Awards.
Pop artist Austin Mahone pointed at photographers during the American Music Awards arrivals.
TLC members Chilli and TBoz posed together on the red carpet.
Pop rock artist Chris Daughtry smiled as he arrived at the award ceremony.
TV personality Daisy Fuentes, a presenter at the awards, is seen on the red carpet.
Actress Emma Roberts, featured in the film We're the Millers, posed on the red carpet at the awards.
Pop group Fifth Harmony shared a moment together before the American Music Awards.
E! News host Giuliana Rancic took a moment to pose on the red carpet prior to the awards.
Model Heidi Klum stepped out during the pre-ceremony arrivals at the AMAs.
Actress Jaimie Alexander struck a pose for photographers prior to the show.
Singer-songwriter Jordin Sparks, an American Idol alum, was seen on the red carpet.
Kendall, Kylie Jenner
Sisters Kendall and Kylie Jenner posed on the red carpet prior to the ceremony.
Pop artist Ke$ha is seen striking a pose in a black dress on the red carpet.
Musician Kevin Rudolf took a moment to pose for photographers prior to the show.
Country group Lady Antebellum shared a minute for a photo during the arrivals prior to the ceremony.
Lady Gaga was seen sitting on an apparently human-powered costume horse prior to the ceremony.
Former NSYNC group member Lance Bass smiles on the red carpet on Sunday.
Luke Bryan, Caroline Boyer
Country singer Luke Bryan posed with his wife, Caroline Boyer, on the red carpet
Dallas Mavericks owner and AXS TV founder Mark Cuban stepped out on the red carpet on Sunday.
Actress and singer Naya Rivera was seen posing on the red carpet at the American Music Awards.
The band members of One Direction, nominated for favorite album and band at the awards, share a moment prior to the cermony.
R. Kelly, who collaborated with Lady Gaga on ARTPOP, was seen on the red carpet.
Artist Skylar Grey, featured on Eminem's Marshall Mathers LP 2, posed on the red carpet.
Disney channel actress Zendaya was among the attendees at the American Music Awards.
Billy Ray Cyrus
Musician Billy Ray Cyrus, whose daughter Miley Cyrus performed at the event was seen on the red carpet prior to the show.
Singer Ciara, nominated in the Female Artist - Soul/R&B category, posed for photographers prior to the show.
Reality TV star and singer Kelly Osbourne was among attendees at the event.
Singer Miley Cyrus, who performed at the event, posed on the red carpet.
Artist Nelly, who is featured on a nominated song at the event, was seen on the red carpet.
Designer Nicole Richie smiled on the red carpet prior to the show.
Comedian Sarah Silverman was among the attendees at the Sunday night awards event.
Access Hollywood personality Shaun Robinson took a moment to pose on the red carpet.
Avatar and Star Trek Into Darkness actress Zoe Saldana was among the attendees at the awards event.
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