Sharks edge final thriller
Cross took the lead, playing down the slope, when Dave Hudson crossed for a try which Alex Whittaker converted but although Adam Masson scored a second unconverted try, it was Celtic who led 12-10 at the break, with Tom Perks among their scorers.
Paul Adams edged the Sharks back in front with a try in the corner before scrum-half Andrew Tillotson slotted over a vital drop-goal.
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Hide AdTom Stuckey extended the Cross lead with another try wide out but Celtic refused to give in and replied with a late converted try to set up a grandstand finish.
Cross had prop Tere Ioiane in outstanding form and the Sharks defence repelled late Celtic pressure to hold on and lift the cup.