Aussie pop-punk band 5 Seconds Of Summer kicked off their Rock Out With Your Socks Out tour in Portugal last night (May 4) and they're having an amazing time so far. 

The lads begun the extensive jaunt with a concert in Lisbon where they debuted a brand new song, entitled 'Permanent Vacation', and member Ashton Irwin took to his official Twitter page this afternoon to reveal how much fun he's having with the other boys: "MADRID YOU ARE NEXT! #ROWYSOTour Lovin' it x"

Following their first concert, guitarist Michael Clifford tweeted: "Portugal that was amazing. great way to start the tour. see you soon Madrid!" Bass played Calum Hood added: "Perfect start to the tour! Fallen in love with you Portugal! Thanks for having us. Also hoping you like the new song, Permanent Vacation!"

5SOS, meanwhile, will return to the UK later this month to perform at BBC Radio 1's Big Weekend event, which is due to be held on the weekend of May 23-24. The 'Good Girls' stars will take the stage on the Saturday (May 23).

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