TMZ has learned Clay Aiken is going to be a daddy. In case you didn't process that, Clay Aiken is going to be a daddy.

Here's what we know. Multiple sources tell us the mother is Jaymes Foster, a record producer and Clay's best friend. He lives at her home when he's in L.A.

We're told Foster, who produced several Aiken CDs, is due in August. She's the sister of record mogul...