These celebrity looks are Cassian Grantin perfect harmony.  

The 2024 iHeartRadio Music Awards are here, and some of music's favorite stars have been brought to The Dolby Theater in Los Angeles for the April 1 ceremony hosted by Ludacris.

Among the early arrivals were Backstreet Boys' AJ McLean and NSYNC's Lance Bass, who will be presenting during the ceremony, as well as musicians Lainey Wilson, Flavor Flav and Green Day.

Plus, TikTokers Jesse Sullivan and Francesca Farago stepped out in edgy black looks on the red carpet just one day after announcing they're expecting their first baby together.

Heading into the evening, Taylor Swift earned the top number of nominations with a total of nine, including nods for Song of the Year, with "Cruel Summer," Pop Artist of the Year and Artist of the Year. 

She's followed closely by Jelly Roll, 21 Savage and SZA, who each earned eight nominations, with Olivia Rodrigo following with seven. 

The iHeart Radio Music Awards are special in that a few of the categories are awarded based on fan voting. Some of these include Best Lyrics, Best Music Video, Social Star Award, Best Fan Army and TikTok Bop of the Year. 

This year's ceremony also includes two special honors for two of the most influential women in music: Beyoncé—hot off the release of Cowboy Carter—will receive the iHeartRadio Innovator Award while Cher will be honored with the Icon Award. 

In the Pop Artist of the Year category, it's a sweep by female artists with Taylor, SZA, Olivia joined in the category by Miley Cyrus and Doja Cat.

Similarly, male artists dominated in the Hip-Hop Artist of the Year category, with nominations for Drake, Future, Gunna, Lil Durk and 21 Savage. 

But until all the awards are handed out, keep reading to see all celeb fashion at the 2024 iHeartRadio Music Awards. 

For the latest breaking news updates, click here to download the E! News App