Niall Horan thinks "many" pints of Guinness will be drunk today to celebrate Saint Patrick's Day.

Niall, the only Irish One Directioner, took to his Twitter account earlier to pass on good wishes to his loyal followers.

"Happy st Patricks day everyone, especially all my fellow Irish out there! Many pints of guiness will be had today I can Imagine (sic)," the Irish charmer posted.

Niall wasn't the only One Direction member to get in on the celebrations though, with Harry Styles also keen to enjoy the festivities.

"Happy St. Patrick's day everyone!!" Harry tweeted.

It wasn't all fun and games for the pop heartthrobs though, as the band are busy working on their forthcoming Where We Are stadium tour, which kicks off in Latin America in April.

"Back to worrrrkkkkkkk!!! Feels like 1st day of school... Ready for the social not for the work aha (sic)," Liam Payne told his fans yesterday.

Despite the boys' excitement to get back on the road, their latest musical offering Midnight Memories hasn't fared well in the charts.

The single, which is the title song from their third studio album, charted at number 39 in the UK yesterday making it the first single released by One Direction to not make it into the top ten.

Niall isn't letting the news affect his Irish celebrations today and tweeted his followers a message filled with fun emojis; music notes, fiddles, beers and of course, four leaf clovers.