29-year-old Miranda was snapped without hers in New York last week, and a friend of the couple told Famous magazine that their relationship could be on the rocks.
"[Miranda and Orlando's marriage] might be in trouble," they said.
"She's not wearing her ring, and she's had a lot on her plate — it could be that somewhere along the way her relationship with Orlando may have slipped between the cracks," said the friend.
But Miranda's new rep, Annie Kelly, has denied the claims. "There is absolutely no truth in the headline or story," she said.
The duo, who announced they had married on 22 June 2010 (just one day after announcing their engagement) have been dating since 2007.
They have one child together — 18-month-old Flynn.