The Secrets & Lies star wed art director Michael Mayhew in a low-key ceremony at a registry office in south London in June last year (10).
She spoke about the surprise nuptials during an interview on U.K. TV show This Morning on Wednesday (27Apr11), and told of her relief after so many years as an unmarried couple.
Blethyn says, "(It was) last June. After a 35-year engagement! It just seemed the time was right. Michael decided to leave the National Theatre and it just seemed right. We had a quiet wedding in Peckham registry office, and Michael took it so seriously. His chin started to quiver as we were taking our vows. I was in hysterics.
"It does actually feel different. I can't put my finger on what it is. It's kind of like a continual cuddle. I can't explain it."
Mayhew is Blethyn's second husband - she wed Alan Blethyn in 1964 but their marriage ended in 1973.