Pitbull, Kelly Clarkson, 2019 CinemaCon

Matt Winkelmeyer/Getty Images for CinemaCon

Celebs such as Kelly Clarkson, Ansel Elgort, Melissa McCarthy took center stage at CinemaCon 2019 this week.

Wearing a colorful checkered dress, Clarkson appeared at the official convention of the National Association of Theatre Owners, held at the Colosseum at Caesars Palace in Las Vegas, to promote the upcoming animated film UglyDolls. The Grammy-winning singer portrays the character Moxy in the movie, which is about imperfect dolls who hope a child will take them home, and also recorded songs for its soundtrack. Onstage, she appeared with co-star Pitbull and also performed one of the tracks.

"So awesome to finally get to perform 'Broken and Beautiful' my new single for Ugly Dolls at CinemaCon," Clarkson wrote on Instagram. "Can't wait for everyone to see this beautiful movie! Annnd I loved getting to catch up with @pitbull and @melissamccarthy."

Elgort spoke onstage about the movie Goldfinch, which also stars Sarah Paulson, Nicole Kidman, and Finn Wolfhard.

McCartney attended the convention to promote her new film The Kitchen and she and her husband Ben Falcone had themselves quite a bit of fun by dressing up like dragons. The actress joked onstage that she thought she was at Comic-Con.

Other stars who appeared at CinemaCon to promote new films included Helen MirrenDiana KeatonKatie HolmesJessica Chastain and Charlie Hunnam.

Check out photos from the event.

CinemaCon celebs, Octavia Spencer

VALERIE MACON/AFP/Getty Images

CinemaCon celebs, James Marsden

Matt Winkelmeyer/Getty Images for CinemaCon

CinemaCon celebs, Dwayne Johnson, Jason Statham

VALERIE MACON/AFP/Getty Images

CinemaCon celebs, John Cena and Jim Carrey

Alberto E. Rodriguez/Getty Images for CinemaCon

Kelly Clarkson, 2019 CinemaCon

Matt Winkelmeyer/Getty Images for CinemaCon

Ansel Elgort, 2019 CinemaCon

Matt Winkelmeyer/Getty Images for CinemaCon

Ben Falcone, Melissa McCarthy, 2019 CinemaCon

Matt Winkelmeyer/Getty Images for CinemaCon

Helen Mirren, 2019 CinemaCon

Alberto E. Rodriguez/Getty Images for CinemaCon

Tiffany Haddish, 2019 CinemaCon

Matt Winkelmeyer/Getty Images for CinemaCon

Charlie Hunnam, 2019 CinemaCon

Gabe Ginsberg/WireImage

Jessica Chastain, 2019 CinemaCon

Matt Baron/Shutterstock

Diane Keaton, STX Films Presentation, CinemaCon

Rob Latour/REX/Shutterstock

Dave Bautista, 2019 CinemaCon

Gabe Ginsberg/WireImage

Pitbull, Kelly Clarkson, 2019 CinemaCon

Matt Winkelmeyer/Getty Images for CinemaCon

Katie Holmes, 2019 CinemaCon

Gabe Ginsberg/WireImage

Chadwick Boseman, 2019 CinemaCon

Gabe Ginsberg/WireImage

Aisha Tyler, 2019 CinemaCon

Dan Steinberg/Shutterstock

Don't miss E! News every weeknight at 7, only on E!

We and our partners use cookies on this site to improve our service, perform analytics, personalize advertising, measure advertising performance, and remember website preferences. By using the site, you consent to these cookies. For more information on cookies including how to manage your consent visit our Cookie Policy.