Halle Berry treated Nahla to an afternoon at Knott's Berry Farm outside of LA on Saturday. Despite Halle's walking cast, she took Nahla on the Ferris wheel and for a spin on a train ride. It was a fun mother-daughter outing for the duo after news of Halle's engagement to Olivier Martinez was confirmed by Olivier himself over the weekend. Rumors started in January when Halle was spotted wearing a new piece of jewelry on her left hand, though they kept quiet on their relationship status until now. Halle's emerald engagement ring apparently has special inscriptions that hold meaning for the couple. There have been many sweet moments for Halle and Olivier since they started dating in 2010, and it looks like they're committed to making more memories together as they prepare to head down the aisle.