Justin Bieber and Selena Gomez have been red-hot this week, flaunting their love while on vacation in Maui. But while they are being flashy with their PDA, many fans are wondering if their love can last. Along with other power couples such as Robert Pattinson and Kristen Stewart, Kim Kardashian and Kris Humphries, and Prince William and Kate Middleton, our favorite celebrities all seem to be dating each other! Check out the pictures and tell us what couple will make it for the long haul — and who is destined to split!