By Cliff Renfrew - Radar Staff Reporter
Shia LeBeouf’s former girlfriend and the Mumford & Sons singer are believed to have got engaged in England last weekend.
The UK newspaper The Sun is reporting that Marcus, 24, popped the question to Carey, 26, during an intimate romantic holiday at plush Babington House in Somerset.
An on-looker told the newspaper: “Carey looked like the cat who had got the cream. She was wearing a beautiful ring and didn’t seem to mind who saw it.
“They were stuck together like glue. She was doing most of the talking and he was hanging on her every word.”
The pair met after Carey went to see his band perform in Nashville, Tennessee, earlier this year.
Mulligan – who was nominated for an Oscar last year for An Education – has only just split up with her Money Never Sleeps co-star Shia LeBeouf.
Carey and her new beau have been spotted at various Mumford & Sons concerts together during their Railroad Revival tour.
The British folk band has enjoyed huge success with their debut album Sigh No More which became a huge hit around the world.
Before hooking up with Mulligan, Marcus dated folk singer Laura Marling.