The duo have penned fresh deals which will see them remain at McDiarmid Park until the summer of 2015.
Of Scobbie and Easton, both 25, Saints boss Tommy Wright said: "It's great to have them tied up on extended deals.
"Both have been very influential for us and, coming on the heels of Gary McDonald and Scott Brown renewing their contracts recently, it is good news. We will be working hard to tie up others in the weeks ahead."
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