PHOTO: Rihanna Wears Gold Necklace Believed to Be From Ex Chris Brown.

It looks like Rihanna may have ex-boyfriendChris Brown on her mind.

The "Diamonds" singer stepped out in NYC last night wearing the gold Christian Lacroix necklace that's widely believed to have been a gift from Brown. RiRi looked casual yet chic while sporting the glamorous jewelry paired with sneakers, blue skinny jeans, a black sweater and sunglasses with a black beanie.

RiRi sported the same gold necklace on Christmas Day 2012 when the couple spent the holiday enjoying a Lakers game togetherin L.A.