United Kingdom, March 12 -- Hilary Duff's husband Matthew Koma has undergone a vasectomy whilst she's pregnant with their third child.

The 36-year-old actress - who has 11-year-old son Luca with first husband Mike Comrie and Banks, five, and Mae, two, with Matthew - is seemingly done adding to her brood after her other half had the operation for permanent male contraception.

He documented his day at the hospital with his social media followers.

On the way, he captioned a car selfie: "It's vasectomy day!!!"

All gowned up in the hospital, he updated his followers: "Just took a Valium and feeling hyped."

He insisted it was less painful than he anticipated.

Matthew said: "It's honestly not bad at all.

"Like better than going to the den...