Actress Jennifer Lawrence was recently spotted at the backstage of iHeartRadio Music Festival, rooting for her rumoured boyfriend and singer Chris Martin.

Lawrence supported the Coldplay frontman at the fest in Las Vegas Sep 19, reports usmagazine.com.

"The Hunger Games` star wore black skinny jeans and a midriff-baring studded crop top.

"People were stopping in their tracks staring at her and talking about how good she looked," said a source.

Martin looked casual in black jeans and a white T-shirt.

After spending some time backstage, Lawrence headed to the VIP section to watch Martin perform at the star-studded music festival.

"She put her hand on her heart when they announced Coldplay," said a source.