WATCH: Louis Tomlinson Left Embarrassed After 'Forgetting' 'Teenage Dirtbag' Lyrics On One Direction Tour

Maybe he should have spent more time in rehearsals?!

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Louis Tomlinson was left red-faced after forgetting the lyrics to the band's cover of 'Teenage Dirtbag' during One Direction's show in Cardiff over the weekend.

The boy band released their Comic Relief single 'One Way Or Another (Teenage Kicks),' a mesh of Blondie and Wheatus' classic hits, just a few weeks ago but it seems the complex lyrics were just too difficult for Louis to remember and he bravely admitted to the audience that he had “forgotten” the words.

Louis Tomlinson performing at the O2 Arena (Carly Lemon/

While Zayn Malik and co managed to rock out to the lyrics without hesitance, Louis looked a little sheepish when his turn came round, before confessing: “Okay, I've just forgotten the lyrics. I'm not even going to pretend I know them!"

At least he's honest! After standing on the stage looking a little dumbfounded, Louis was consoled by his pal Zayn, who gave him a little pat on the back.

The 'Take Me Home' tour appears to have going well so far, unlike their pal Justin Bieber, but reports recently emerged that the boys have decided to hire extra security after Harry Styles was hit in the groin by a shoe.

“Harry is not joking, he's taking the situation very seriously. He's mentioned high-security cars like the ones used by military top brass, plus a convoy,” an insider told the Daily Star.

“He also feels there are Taylor Swift followers out there who may hold a grudge against him following their break-up.”

Watch the awkward moment when Louis forgets the lyrics below...

One Direction Kick Off Take Me Home World Tour At London's O2
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One Direction perform their first concert for their Take Me Home World Tour (WENN, 240312)