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Parramatta are trying to end a 36-year premiership drought, while Penrith are aiming to become just the second NRL team this century go back to back.
But first, Newcastle and Parramatta are both trying to win their first NRLW premierships.
Follow all the action live.
By Jon Healy
Upton goes over for Newcastle!
Just as I wrote that she was pivotal in the first half, Knights fullback Tamika Upton extends their lead, drifting across the field before turning on the speed and scything between Tayla Preston and Rikeya Horne to touch down.
It makes the lead 18-6, but Kirra Dibb's wayward kicking (1/4) means the Eels have a sniff if they can get their stuff together.
By Jon Healy
Newcastle in control heading into second half of NRLW grand final
The Eels struck first in the NRLW decider, but since then it's been all Newcastle.
Kiana Takairangi, Emmanita Paki and Romy Teitzel ran in tries in quick succession in the second quarter of the game, with fullback Tamika Upton playing a huge role out there.
It's 14-6 as the teams return after half-time.
By Jon Healy
Grand final day is here!
The Sun is shining and the Olympic Stadium track looks swift for rugby league's biggest day.
I'm Jon Healy and I'll be your guide through all the action.
We've already seen the State Championship, the NRLW decider is in full swing, and the it's the men's grand final between Penrith and Parramatta.
So we've got plenty to bring you. It's best you stick around for the next few hours.