Singer Miley Cyrus (L) and rapper Flavor Flav pose backstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2012 in Las Vegas, Nevada. (Isaac Brekken/Getty Images for Clear Channel/AFP)

Rapper Flavor Flav was left red faced at the iHeartRadio Music Festival in Las Vegas over the weekend after mistaking Miley Cyrus for Gwen Stefani.

The former Public Enemy star was seemingly thrilled to meet Cyrus at the event after bumping into her backstage, but shouted, "Gwen Stefani. Wow... How you doing? Oh my god, nice to meet you."

An embarrassed Cyrus, who recently dyed her hair platinum blonde like Stefani, was too polite to correct his error, and after they parted ways the rapper walked away yelling the No Doubt frontwoman's last name.

Flavor Flav's handlers then alerted the 53 year old to his mistake, and the stunned reality star's jaw dropped as he exclaimed: "That's Miley? No. That's Hannah Montana? Y'all (are) stupid!"

He then ran back to Cyrus to right his wrongs, and approaching her again, he said, "Do me a favour, smack me."

The pair then hugged it out and the incident was all captured on camera by TMZ.com.

Miley Cyrus and Gwen Stefani at the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2012 in Las Vegas, Nevada. (Isaac Brekken/Getty Images for Clear Channel/AFP)