Swoon. Watch hottie Jared Leto and the boys from Thirty Seconds to Mars’ rendition of "Stay," and try not to melt into a puddle.

iHeartRadio Music Festival performers, Thirty Seconds to Mars visited BBC Radio 1’s Live Lounge in London and performed this sick cover of Rihanna’s “Stay.”

We’ll be watching this video over and over until the show this weekend!

Don't miss Thirty Seconds to Mars at the iHeartRadio Music Festival this weekend, 9/20 and 9/21 at 10pm ET! For details: http://festival.iheartradio.com