Julianne Hough, 2019 iHeartRadio Music Festival

Gabe Ginsberg/Getty Images for iHeartMedia

The 2019 iHeartRadio Music Festival is on and popping! 

Now in its eighth year, the two-day event hosted by Ryan Seacrest boasts its most star-studded performance lineup yet. Miley Cyrus, Alicia Keys and Camila Cabello will take the stage inside T-Mobile Arena in Las Vegas, in addition to Billie EilishBackstreet BoysCage The Elephant, Chance The Rapper, Def Leppard, French Montana, Green DayHalsey, Heart, H.E.R., Mumford & Sons, Tim McGraw, Zac Brown Band, Hootie & the Blowfish, Marshmello and Steve Aoki with special guests Darren Criss and Monsta X.

But if you weren't able to snag a ticket to the sold-out festival, have no fear! 

Performances will be broadcast live via iHeartMedia radio stations throughout the country, and The CW will also exclusively livestream both nights of the festival via The CW App and CWTV.com. Then on Oct. 2 and Oct. 3, The CW will air a two-night television special highlighting the event's greatest moments. 

Check out all the star sightings from the highly-anticipated weekend in our gallery below: 

Miley Cyrus, 2019 iHeartRadio Music Festival

Kevin Winter/Getty Images for iHeartMedia

T-Pain, 2019 iHeartRadio Music Festival

Kevin Mazur/Getty Images for iHeartMedia

Def Leppard, Vivian Campbell, Phil Collen, 2019 iHeartRadio Music Festival

Denise Truscello/Getty Images for iHeartMedia

Def Leppard, Joe Elliott, 2019 iHeartRadio Music Festival

Kevin Winter/Getty Images for iHeartMedia

Def Leppard, 2019 iHeartRadio Music Festival

Kevin Winter/Getty Images for iHeartMedia

Ashley Iaconetti, Jared Haibon, Tayshia Adams, Mike Johnson, Dean Unglert, Caelynn Miller-Keyes

Amy Plumb for iHeartRadio

Lucy Hale, 2019 iHeartRadio Music Festival

Bryan Steffy/Getty Images

Tanya Rad, 2019 iHeartRadio Music Awards

David Becker/Getty Images for iHeartMedia

Marshmello, Kane Brown, iHeartRadio Music Festival

Kevin Mazur/Getty Images for iHeartMedia

Chance the Rapper, 2019 iHeartRadio Music Festival

Kevin Mazur/Getty Images for iHeartMedia

Audrina Patridge, 2019 iHeartRadio Music Festival

JB Lacroix/WireImage

H.E.R., 2019 iHeartRadio Music Festival

Gabe Ginsberg/Getty Images for iHeartMedia

Miley Cyrus, 2019 iHeartRadio Music Festival

Kevin Mazur/Getty Images for iHeartMedia

Christina Aguilera, 2019 iHeartRadio Music Festival

JB Lacroix/WireImage

Monsta X, 2019 iHeartRadio Music Festival

JB Lacroix/WireImage

Camila Cabello, 2019 iHeartRadio Music Festival

JB Lacroix/WireImage

Lil Nas X, 2019 iHeartRadio Music Festival

Kevin Winter/Getty Images for iHeartMedia

Tim McGraw, 2019 iHeartRadio Music Festival

Bryan Steffy/Getty Images

Caelynn Miller-Keyes, Dean Unglert, Jared Haibon, Ashley Iaconetti

Amy Plumb for iHeartRadio

Backstreet Boys, 2019 iHeartRadio Music Festival

Denise Truscello/Getty Images for iHeartMedia

Teddi Mellencamp, 2019 iHeartRadio Music Festival

JB Lacroix/WireImage

Darren Criss, 2019 iHeartRadio Music Festival

Gabe Ginsberg/Getty Images for iHeartMedia

Green Day, 2019 iHeartRadio Music Festival

Kevin Winter/Getty Images for iHeartMedia

French Montana, 2019 iHeartRadio Music Festival

Kevin Mazur/Getty Images for iHeartMedia

Mike Johnson, 2019 iHeartRadio Music Festival

David Becker/Getty Images for iHeartMedia

Tori Spelling, Ian Ziering, 2019 iHeartRadio Music Festival

JB Lacroix/WireImage

Dennis Quaid, 2019 iHeartRadio Music Festival

David Becker/Getty Images for iHeartMedia

Ryan Seacrest, 2019 iHeartRadio Music Festival

imageSPACE/Shutterstock

Julianne Hough, 2019 iHeartRadio Music Festival

Gabe Ginsberg/Getty Images for iHeartMedia

Dean Unglert, Jared Haibon, 2019 iHeartRadio Music Festival

Amy Plumb for iHeartRadio

Green Day, 2019 iHeartRadio Music Festival

JB Lacroix/WireImage

James Van Der Beek, 2019 iHeartRadio Music Festival

AFF-USA/Shutterstock

Sisanie Reategui, 2019 iHeartRadio Music Festival

Gabe Ginsberg/Getty Images for iHeartMedia

Old Dominion, 2019 iHeartRadio Music Festival

Gabe Ginsberg/Getty Images for iHeartMedia

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