The boyband are currently halfway through their tour of the States and have been promoting their first official US single 'Glad You Came'.
The band tweeted: "Philly! Thank you for an amazing sold out show. We're speechless :x #thankyou #soldout #TWUSAFanmily."
They later added: "Can't comprehend that our #TWUSAFanmily sold out our show in Los Angeles! You are all unbelievable #Thankyou #SoldOut."
Following their performance of 'Glad You Came' on The Ellen DeGeneres Show earlier this month, the track has risen to number 36 on the US iTunes chart.
> Justin Bieber manager 'backs The Wanted in US'
Watch The Wanted perform 'Glad You Came' on The Ellen DeGeneres Show below: