Star Couples: Will It Last?

Do Ben Affleck and Jennifer Garner have what it takes to stay together? You be the judge: Cast your vote on them, Beyoncé and Jay-Z, Cameron and Justin, and others. By Serena Kappes

SCARLETT JOHANSSON & JARED LETO

Though their relationship has been on-again, off-again since they were first spotted canoodling in May, Johansson and Leto (smooching in Los Angeles in November) are still together, a source close to the couple tells PEOPLE.