CREATE TABLE table_23251 ("Order" FLOAT, "Couple" TEXT, "Karen" TEXT, "Nicky" TEXT, "Jason" TEXT, "Ruthie" TEXT, "Robin" TEXT, "Total" TEXT, "Skating song" TEXT, "Scoreboard" TEXT, "Public vote" TEXT)

Name the karen when nicky is 2.5
SELECT "Karen" FROM table_23251 WHERE "Nicky" = '2.5'
SELECT "Karen" FROM "table_23251" WHERE "Nicky" = '2.5'