Photo Alert!: 1D Mania Begins in Chicago!

UK X Factor group One Direction kicked off their US tour with Big Time Rush last night in Chicago and the mania has begun! See below for full recap and go here to download all of the photos from Chicago:

Check out their performance of “What Makes You Beautiful” from the event here:

They then headed over to the Rosemont Theater for soundcheck and were greeted by hundreds of fans..

Check out the video of them outside the venue here:

It was then time for their debut US performance on the Big Time Rush “Better With U” Tour.

The tour concludes March 9th at Radio City in NYC...

Tune in to the band’s US television performance debut on Today, March 12th.

Their debut album, UP ALL NIGHT features the single “What Makes You Beautiful” which is currently the highest charting UK group debut on the Billboard Hot 100 in over 15 years since the Spice Girls!!

Be on the lookout for more updates throughout the tour….

Photos: Calvin Aurand/Sony