Niall Horan is best man at his brother Greg's wedding
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Taking time out of the band's huge UK tour, the 19-year-old made the trip to St Michael's Church in Castletown Geoghegan in County Westmeath, Ireland, for the ceremony yesterday.
Looking suitably dapper, the Irish pop star apparently arrived singing The Day I Crashed The Wedding as he drove members of the wedding party to the church.
Greg, who married girlfriend Denise Kelly, spoke to The Irish Sun before the big day.
He said: "He has been working on the speech as far as I know so we will see how that goes.
"He’s my only brother - there was never any other choice for my best man than Niall."
As well as watching his big bro getting hitched, Niall apparently also learnt that he's going to be an uncle.
Greg, 25, reportedly invited the other band members to the wedding, but as none of them RSVP’d they didn't attend.
Some 1D fans turned up to the church, but not wanting to take attention from his brother the pop star stopped briefly to sign autographs before entering the church.
According to The Sun, there were a few 1D fans who managed to dodge minders and get into Niall’s unlocked Range Rover, with one yelling “I’ll never wash this ar*e again.”
We’re sure that didn’t affect the happy couple on their special day - congrats Greg and Denise!