Hailee Steinfeld, Niall Horan fuel dating speculation at Backstreet Boys concert

Hailee Steinfeld and Niall Horan didn’t do much to squash those pesky dating rumors on Saturday, February 17, when they attended a Backstreet Boys concert in Las Vegas together.

The Pitch Perfect actress, 21, looked casual in a long-sleeve black shirt and blue jeans, leaving her brown locks to hang loose, while Horan wore a blue paid shirt and dark jeans. They were spotted laughing, dancing and singing along at the concert, held at the Planet Hollywood Resort and Casino.

The pair were also spotted hanging out later at XS Nightclub, where they sat together with friends, sipping on Absolute Elyx cockails while watching Diplo spin.

Fans began speculating that the One Direction singer and Steinfeld were dating after they were spotted together at London’s West End production of Hamilton on January 2. A week later, Horan attended a birthday party for the “Starving” songstress’ older brother, Griffin.

The True Grit actress didn’t exactly deny the rumors while speaking exclusively with Us Weekly last month. “I feel so lucky that [my fans] care enough about me to know what I’m doing every second of every day, but I think that sometimes it’s hard for people, in general, to realize that there are boundaries to a person’s life and personal life. I am a very private person,” she told Us. “I do love that I have the opportunity to share with them what I’m comfortable with and they’re there to listen and support me.”

Steinfeld and the “Seeing Blind” singer, 24, have been close friends for years — he even sweetly called her “the loveliest person on the planet” on Instagram in December.

RELATED: Celebrities you forgot dated:

83 PHOTOS
Celebrities you forgot dated
See Gallery
Celebrities you forgot dated

Kurt Russell and Season Hubley

(Photo by Donaldson Collection/Michael Ochs Archives/Getty Images)

George Clooney and Talia Balsam

(Photo by Jim Smeal/WireImage)

Owen Wilson and Sheryl Crow

(Photo by Jim Smeal/WireImage)

Billy Bob Thornton Laura Dern

(Photo by Frank Trapper/Corbis via Getty Images)

Liam Neeson and Brooke Shields

(Photo by Raoul Gatchalian/IMAGES /Getty Images)

Long before Michael Weatherly became Special Agent Anthony Dinozzo on 'NCIS," and Jessica Alba was the founder of the Honest Company, they were engaged to each other after starring on the show "Dark Angel" together. 

 (Photo by Gregg DeGuire/WireImage)

Chris Klein and Katie Holmes

(Photo by SGranitz/WireImage)

Julia Roberts and Kiefer Sutherland

(Photo by Ron Galella, Ltd./WireImage)

Michael Keaton and Courteney Cox

(Photo by Ron Galella, Ltd./WireImage)

Paula Abdul and John Stamos

(Photo by Ron Galella, Ltd./WireImage)

Jill Schoelen and Brad Pitt

(Photo by Ron Galella, Ltd./WireImage)

Wilmer Valderrama and Lindsay Lohan

(Photo by Gregg DeGuire/WireImage for NARAS)

Tom Cruise and Mimi Rogers

(Photo by Ron Galella, Ltd./WireImage)

Helen Mirren and Liam Neeson

via Old Loves

Matt Damon and Winona Ryder

(Photo by Ron Galella, Ltd./Wireimage)

Shia LaBeouf and Carey Mulligan

(Photo by Ray Tamarra/Getty Images)

Nick Cannon and Kim Kardashian

(Photo by Michael Tran/FilmMagic)

Ashton Kutcher and January Jones

(Photo by Ron Galella, Ltd./WireImage)

Matthew Broderick and Helen Hunt

(Photo by Ron Galella/WireImage)

John Mayer and Jessica Simpson

(Photo by Kevin Mazur/WireImage)

Kimberly Russell and George Clooney

(Photo by Jim Smeal/WireImage)

Joey Lawrence and Keri Russell

(Photo by Ron Galella, Ltd./WireImage)

Courteney Cox and Paul Brown

(Photo by Ron Galella/WireImage)

Cameron Diaz and Matt Dillon

(Photo by Ron Galella, Ltd./WireImage)

Rachel Miner and Macaulay Culkin

(Photo by Steve Eichner/Getty Images)

Carson Daly and Tara Reid

(Photo by SGranitz/WireImage)

Amber Rose and Kanye West

(Photo by Kevin Mazur/WireImage)

Jennifer Love Hewitt and Joey Lawrence

(Photo by Ron Galella, Ltd./WireImage)

Drew Barrymore and Fabrizio Moretti

(Photo by Michel Dufour/WireImage)

Tom Green and Drew Barrymore

(WireImage)

Donald Faison and Minka Kelly

(Photo by Jon Kopaloff/FilmMagic)

Kim Kardashian and Kris Humphries // Brody Jenner and Avril Lavigne

Kevin Mazur via Getty Images

Heath Ledger and Heather Graham

(Photo by Jean-Paul Aussenard/WireImage)

Common and Serena Williams

(Photo by Stephen Lovekin/Getty Images)

Christina Ricci and Adam Goldberg

(Photo by Sylvain Gaboury/FilmMagic)

Antonio Banderas and Ana Leza

(Photo by Ron Galella/WireImage)

Diane Keaton and Warren Beatty

(Photo by Ron Galella/WireImage)

Sarah Jessica Parker and Robert Downey, Jr.

(Photo by Ron Galella, Ltd./WireImage)

Vivica A. Fox and Dennis Rodman

(Photo by Ron Galella, Ltd./WireImage)

Drew Barrymore and Corey Feldman

(Photo by S. Granitz/WireImage)

Cher and Val Kilmer

(Photo by Barry King/WireImage)

Liza Minnelli and Desi Arnaz Jr.

(Photo by Ron Galella/WireImage)

John Mayer and Taylor Swift

(Photo by Theo Wargo/WireImage)

Geena Davis and Jeff Goldblum

(Photo by Barry King/WireImage)

Anne Heche and Ellen DeGeneres

(Photo by Ron Galella/WireImage)

Gilda Radner and Bill Murray

(Photo by Ron Galella/WireImage)

Whoopi Goldberg and Lyle Trachtenberg

(Photo by Ron Galella, Ltd./WireImage)

Robert De Niro and Toukie Smith

(Photo by Robin Platzer/IMAGES/Getty Images)

John Mayer and Minka Kelly

(Photo by James Devaney/WireImage)

David Moscow and Kerry Washington

(Photo by Denise Truscello/WireImage)

Jennifer Aniston and John Mayer

(Photo by Jon Kopaloff/FilmMagic)

Anne Hathaway and Raffaello Follieri

(Photo by Bob Riha Jr/WireImage)

Cameron Diaz and Justin Timberlake

(James Devaney via Getty Images)

Jennifer Garner and Scott Foley

(Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)

Dennis Quaid and Meg Ryan

(Photo by David Keeler/Online USA)

Rachael Leigh Cook and Shane West

(Photo by George Pimentel/WireImage)

Christian Slater and Patricia Arquette

(Photo by Ron Galella, Ltd./WireImage)

Sarah Paulson and Cherry Jones

(Photo by E. Charbonneau/WireImage for CW Productions)

Derek Jeter and Minka Kelly

(Photo by Mike Coppola/FilmMagic)

Jon Voight and Eileen Davidson

(Photo by Ron Galella, Ltd./WireImage)

Jon Voight and Stacey Pickren

(Photo by Ron Galella, Ltd./WireImage)

Jake Gyllenhaal and Kirsten Dunst

(Photo by Justin Goff\UK Press via Getty Images)

Scarlett Johansson and Jared Leto

(Photo by Amy Graves/WireImage)

Joaquin Phoenix and Liv Tyler

(Photo by Richard Corkery/NY Daily News Archive via Getty Images)

Sarah Larson and George Clooney

(Photo by James Devaney/WireImage)

George Clooney and Karen Duffy

(Photo by Arnaldo Magnani/Getty Images)

Ben Affleck and Gwyneth Paltrow

(Photo by Ron Galella, Ltd./WireImage)

Samantha Ronson and Lindsay Lohan

(Photo by Jamie McCarthy/WireImage for Glaceau)

Chili (from TLC) and Usher

(Photo by SGranitz/WireImage for BET Entertainment)

Kylie Minogue and Lenny Kravitz

(Photo by Dave M. Benett/Getty Images)

Brittany Murphy and Ashton Kutcher

(Photo by Jim Smeal/WireImage)

Miley Cyrus and Nick Jonas

(Photo by Mathew Imaging/FilmMagic)

Fiona Apple and David Blaine

(Photo by Evan Agostini/Liaison)

Jessica Biel and Chris Evans

(Photo by Jon Kopaloff/FilmMagic)

Drew Barrymore and David Arquette

(Photo by Ron Galella, Ltd./WireImage)

Jennifer Lopez and Chris Judd

(Photo credit should read STAN HONDA/AFP/Getty Images)

Kid Rock and Pamela Anderson

(Photo by Rick Diamond/WireImage)

Christina Applegate and Brad Pitt

(Photo by Barry King/WireImage)

Jared Leto and Cameron Diaz

(Photo by Jeff Kravitz/FilmMagic)

Leonardo DiCaprio and Gisele Bundchen

(Photo by Jeffrey Mayer/WireImage)

Patricia Arquette and Nicolas Cage

(Photo by Ron Galella, Ltd./WireImage)

Sofia Coppola and Keanu Reeves

(Photo by Ron Galella/WireImage)

Matt Damon and Skylar Satenstein

(Photo by Ron Galella, Ltd./WireImage)

HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

Read Full Story

Sign up for Entertainment Insider by AOL to get the hottest pop culture news delivered straight to your inbox!

Subscribe to our other newsletters

Emails may offer personalized content or ads. Learn more. You may unsubscribe any time.