The two pop groups have enjoyed a friendly rivalry in the past, but the fight turned nasty after One Direction's Louis Tomlinson made a sly dig at The Wanted during a recent gig in London.
Tom Parker apparently took exception to his comments and tweeted, "You even talk about us at your own gigs. Are you that upset you didn't get in this band?" to which Tomlinson replied, "Pal, we both know I wouldn't waste my time auditioning for your band. You humour me with your bad boy persona."
Parker then posted a clip of Tomlinson's first audition on the U.K. version of The X Factor and sarcastically commented "nice work", while the What Makes You Beautiful hitmaker insisted, "I actually think you could be the biggest t**t on Twitter... P.S. enjoy the press from this... Funny that face to face you act like a little girl. Goodnight old friend."
His bandmate Liam Payne then interjected: "Tom let's talk about your singing... your amazing tone pierces my ears with every note," while Tomlinson added, "I also heard he wets the bed."
The Wanted's Jay MCGuiness then butted in to give Tomlinson a piece of his mind, writing, "Please stop mentioning us in your gigs, we certainly no longer mention you and it's time to let dead dogs lie. Your passive-aggressive style of speaking makes me cringe... I'm not sure what's happened since we saw you at The X Factor, but you've done a sterling job of becoming one of the most overrated, arrogant and not to mention insincere people around. Your shocking lack of talent will only be forgiven by lots of humility and no-strings-attached friendship among your band. Louis, don't measure your worth in followers or money, because they're fickle, and when they go you might just feel worthless."
Tomlinson tried to get the last word by tweeting, "Jay, this would be a lovely insight for your next book. You must have been a splendid student. Never forget you boys started this."