By Andrew Holleran Brooks Koepka’s new wife, Jena Sims, had some fun inside the U.S. Open clubhouse on Saturday. The actress and model shared a racy photo of herself on Instagram inside of the clubhouse at Brookline on Saturday afternoon. Sims had a joke to go with it. “Got the (country) club goin’ 🆙,” she wrote. Fans took to social media to react. “Dude in the back is happy,” one fan joked. “Obsesssssed,” another fan wrote. “The bloke in the background is thinking “ I need to come into the clubhouse more often,'” one fan added. It’s been a rough U.S. Open for Brooks Koepka, but at least he ha…