All Time Low joined Fearne in the Live Lounge to perform their new single Weightless and a cover of Lady Gaga's Alejandro!
They were only in the UK for a short trip but will be back for this year's Reading/Leeds festival in August.
They talked about their Blink 182 tattoos, how they like to get naked for their fans, and how Zack was only allowed in the band because he's good at skateboarding. Alex also talked about his good friend Demi Lovato (they aren't dating!), and how Ryan has a secret crush on Sophie Ellis Bextor and Phillip Schofield.