Nick Lachey and Vanessa Minnillo got a head start on celebrating their shared Nov. 9 birthdays in Mexico over the weekend. She sported an array of cute bikinis while Nick sipped on a beer and showed off his still-boyband-material shirtless abs. The two had a lot more to toast to than his 37th and her 30th, since they are also newly engaged! Nick popped the question last week and we got our first look at Vanessa's big, sparkly diamond ring, estimated to have cost $125,000, as they headed off on vacation. Nick and Vanessa are huge fans of beachy getaways, but this one is extra special as the couple settles into their affianced status.