Jennifer Aniston and Justin Theroux continued their romantic vacation yesterday, stopping to grab a cup of coffee on the island of Kauai. The pair are doing their best to fit in with tourists and have been spotted visiting local fruit stands, shopping, and hanging with friends. Jen and Justin even dropped by Christine Taylor's 40th birthday celebration Monday night. Justin's the next one to mark the major milestone in his life when he turns the big 4-0 Aug. 10. Jen and Justin have a few more weeks to enjoy their vacation before work draws them back to the mainland. Their upcoming project Wanderlust is scheduled for an Oct. 7 release, though there's a possibility they could return to LA this weekend for the Teen Choice Awards, where Jen's nominated in two categories for her role in Just Go With It.