Kapp joins her wife and teammate Dane van Niekerk to achieve the feat in magenta.
All three of her wickets came in succession finishing with 3-16 from her four overs. The Sixers restricting the Melbourne Stars to 9/107 and, in reply, achieved victory just two wickets down in the 18th over. It is the Sixers second win of the season.
A superb run out by Sixers captain Ellyse Perry (1-17) and wicket taken by leg-spinner Dane van Niekerk (2-18) with her first ball in WBBL|05, were also highlights in the field for the Sixers.
Perry top-scored for the Sixers with 39 not out from 43 balls sharing a pivotal 53-run second wicket partnership with Ashleigh Gardner (32 from 35).
Alyssa Healy also made a quick fire 27 from 18 balls including two sixes at the top of the order.