A goal on 52 minutes from Ciara Phelan secured Kilkenny's sixth title in 10 seasons in the All-Ireland Minor Camogie Championship, accounting for Tipperary at St Brendan's Park Birr by 3-9 to 1-12.
Tipperary drew level as the game entered its conclusion.
And even when Phelan struck with a devastating blow, they still came fighting back, but in one last opportunity, Kilkenny defenders held firm.
Niamh Treacy finished with seven points for Tipperary, but they were rocked back on their heels by two goals in the space of two minutes at the end of the opening quarter.
The first came from Jenny Clifford, before Sarah Walsh made no mistake. Tipperary trailed by 2-7 to 0-7 at half-time.
The Munster girls were a very different proposition after the resumption and a scoring spree that yielded 1-3 without reply brought them level. The goal came from Orla O'Dwyer.
But then Phelan held her cool, having been placed by Clifford, to make it another famous day for the Noresiders.
Meath won the 'B' final, overcoming Derry 4-6 to 2-10 in Inniskeen. Derry looked set for glory when Eimear McGuigan's high ball found its way into the Meath net in the first half.
But Niamh Gallogly pounced for her second goal to achieve parity for the Royals. Aoife Minogue gave them the lead and Amy Gaffney followed up to give Meath the edge.