The former child star, who is now 45, met Barrymore's pal after Drew's mum played matchmaker.
He tells Entertainment Weekly, "I was Bianca's first movie crush, and she kept asking Drew's mother to introduce us. So they set us up on a blind date in 1987 - we saw E.T."
But the couple didn't marry until this summer (12): "Fast forward to 2010: She looked me up on Facebook, and we reconnected."
It's MacNaughton's second marriage - he was previously wed to Jennifer Butler.