It was the Mona McSharry show on the second day of the Irish short course championships in the Lagan Valley Leisureplex.
The sensational teenager delighted everyone in the arena when she broke the 23-year-old 100m freestyle record of controversial Olympian Michelle Smith on two occasions.
The Marlins swimmer smashed it in the morning heats with a new Irish record of 54.65 and then lowered it even further when striking gold in 54.34.
Less than 20 minutes later 18-year-old McSharry added her fourth gold medal of the meet in the 100m breaststroke where she touched in 1:07.91. Bangor's Jordan Sloan took the men's 100m free title, clocking 48.93, ahead of Robbie Powell in 49.22, on a night when once again Ulster swimmers enjoyed the lion's share of medals.
Ards woman Emma Reid, in 27.04, won the 50m butterfly title for the third successive year, touching ahead of sister Rebecca in 27.82. The bronze medal was shared by Otter SC team mates Jena Macdougald and Cara Stapleton who both finished in 28.36.
Reid's 15-year-old clubmate, Amelia Kane, cruised home to victory in the women's 1500m freestyle, winning in 17:02.30 - adding to Thursday's 200m butterfly gold.