Ian Somerhalder: iHeartRadio Music Festival with 'Vampires'!

Ian Somerhalder poses on the red carpet while attending the 2013 iHeartRadio Music Festival on Saturday evening (September 21) at the MGM Grand Garden Arena in Las Vegas, Nev.

The 34-year-old actor was joined at the event by his Vampire Diaries co-star Candice Accola, as well as The Originals‘ Claire Holt and Charles Michael Davis.

PHOTOS: Check out the latest pics of Ian Somerhalder

“Thank you to the CW for bringing me here to Vegas.I love you guys and thank you-Fans, pls thank the CW for bringing me here!!! Xo Ian,” he tweeted at the event.

FYI: Candice is wearing an Alexander McQueen dress and Valentino shoes.

20+ pictures inside of Ian Somerhalder and others backstage at the festival…