One Direction to headline US tour

One Direction have apparently just announced a headline tour of North America while they are believed to be kicking off a tour of Europe in February 2013!Today, Cheryl Cole has joined the long list of celebs to congratulate One Direction on their chart success and never one to miss an opportunity, Cheryl also needled Simon Cowell.She Tweeted: "Congratulations! @louis_tomlinson @niallofficial @harry_styles @zaynmalik @real_liam_payne remember who really mentored you when @simoncowell wasn't there LMAO!! #proudofyouboys."Simon has been gushing about the boys' success on twitter: "I couldn't be happier for @onedirection, it is an incredible achievement. They deserve it. They have the best fans in the world."Katy Perry has also been busy tweeting Mullingar man Niall Horan: "@NiallOfficial congratulations, you didn't let me down! Xo."The former Coláiste Mhuire student replied "Hey katy, thank you, let's hope it holds out this week! Thank you for putting me thru! we've been working hard, I won't let you down."