It's been estimated that there are more stars in the known universe than all the grains of sand, on every beach on earth.
With numbers that staggering, I'd say the odds of the "primordial soup" occurring in places other than Earth are very good. In fact, I'd say that it's a certainty.
DaffY Duck: “I hereby claim this planet in the name of....DUCK DOGERS IN THE TWENTY-FOURTH-AND-HALF CENTURYYYYYYYYYY!!!!!!!”
Porky Pig: “B-b-b-b-big deal.”
Except the premordial soup theory is just speculation without any evidence to support it. Basically the chance of it occuring is about the same as if a tornado went through a junkyard and created a 747. This is because the basic building block of life, DNA, is as complex as a supercomputer. Therefore its virtually impossible that some premordial soup created life even once, let alone several times.
There certainly may be life on other planets, but they were created just like all life, by Intelligent Design.