The four-day conference will focus on the opportunities the SNP believe independence will bring Scotland, with Nationalists seeking to contrast these with the consequences of remaining part of the UK.
Scotland's First Minister Alex Salmond is set to give a welcome address when the conference kicks off later.
More top news
The star said that "uncertainty" in the world had led him to take up a second European passport.
He said NFL stars who refuse to stand for the national anthem in silent protest over human rights should be fired.
The children - who are two of three triplets - were found not breathing at a property in Bridgend, Wales.