EMILY BLUNT and MICHAEL BUBLE

The couple has been an item for two years and the singer is convinced his mum Amber thinks his girlfriend is the best thing about her son.

In a Mother's Day special for America's People magazine, Amber Buble says, "If he doesn't marry her, I might kill him.

"But we'd find someone in the family to marry her because we're not letting her go - ever."

Source: WENN