Hayden Panettiere & Jason Derulo: Billboard Awards After Party!

Hayden Panettiere hits the red carpet at the after party following the 2013 Billboard Music Awards on Sunday (May 19) at Marquee Nightclub in Las Vegas.

The 23-year-old Nashville actress was joined at the event by Jason Derulo and the hot girl group Icona Pop.

PHOTOS: Check out the latest pics of Hayden Panettiere

Also pictured: Bruno Mars hosting a party at the Bank Nightclub that evening as well following the awards show.

In case you missed it, watch the video of Bruno performing his song “Treasure” during the show last night.

FYI: Hayden is wearing a Whetherly striped top.