Sacha Baron Cohen's 40th birthday is today! To mark the special occasion, Sacha and his wife, Isla Fisher, brought their two daughters along for a walk in a Sydney park and a boat ride along the harbor. Later, Isla and Sacha emerged with a friend for an adults-only go-round on the vessel. The Baron Cohen-Fisher clan is in Isla's native Australia, so she can finish up work on The Great Gatsby. Her time on set may be extra sparkly, as Tiffany is providing jewels to the Baz Luhrmann-directed picture, including one-of-a-kind headpieces and necklaces. Isla was also just on set in NYC shooting a comedy with Kirsten Dunst and Lizzy Caplan. While doing press for her own movie Melancholia, Kirsten raved about Isla. Kirsten said, "I love her, she's amazing. We had the best time. Also Lizzy Caplan was in the film and us three girls got along so well. We had a great time together. . . . We worked really long hours and really hard, because it's an independent film, so we didn't have a lot of time to shoot. It was very quick."