Jason Derulo & Taylor Momsen Lend Talents to iHeartRadio Music Festival 2014!

Jason Derulo covers up in his hoodie while posing on the red carpet at the 2014 iHeartRadio Music Festival on Friday (September 19) at the MGM Grand Garden Arena in Las Vegas.

Taylor Momsen was also seen stepping out on the carpet that night with her band The Pretty Reckless.

Jason hit the stage during the first night of the festival for a high energy performance. He showed up as a surprise guest and sang his hit “Talk Dirty.”

Taylor performed for the crowd at the village stage the next day. See photos below in the gallery!