Carey Mulligan took a solo stroll through a London park yesterday afternoon. She was decked out in an all-black ensemble, though her new wedding ring added a touch of sparkle. Carey married Marcus Mumford in late April and the newlyweds made their first public appearance together at the Met Gala in NYC. Carey wore a metallic Prada dress for the occasion and the custom creation is now being auctioned off on eBay. The proceeds will go to benefit Oxfam America and while the price is currently at $2,125, there are still three days left before bidding closes. Carey and Marcus were back in the spotlight last week when they attended the ARK Gala dinner at Kensington Palace.