Niall Horan 'croons to crowd in Miami'

Niall Horan serenades a bevvy of beauties on a night out in Miami, according to reports.

The One Direction heartthrob is currently touring the United States with the hit boy band as part of their On the Road Again World Tour. During a few days off between concerts, the 21-year-old enjoyed a night out with friends in Miami, Florida, but couldn't resist putting on a mini performance.

"He was leaving Bodega Taqueria y Tequila Monday night, and carrying his guitar," an insider told the New York Daily News' Confidential column. "He got a bottle of Grey Goose, which is $400 at Bodega; he paid for the bottle and tipped very well. Five girls met him on the balcony and he picked up his guitar and serenaded them."

The Story of My Life star enjoyed a vantage point on the balcony above the busy bar, reportedly smoking and enjoying watching the crowd below. But once he started strumming on his guitar, his fellow revellers were desperate to get closer to the Irishman.

"Then the crowd below got crazy and tried to get up the spiral staircase, past two security guards, to get a better look at him," the source continued.

Niall and his friends then left the venue at 1.30am.

The star could have been celebrating the success of One Direction's new song Drag Me Down, which raced to the top of the iTunes charts earlier this month after they released it with no prior promotion or warning.

The track is the first single since Zayn Malik left the group in March and the boys were quick to take to Twitter to thank their fans for their enduring support.

"We wanted you guys to have our new single first so here it is!" Louis Tomlinson tweeted. "Thank you for all your constant support. Hopefully you love it , we're proud of it :) (sic)"