ET Top 5: On-Again, Off-Again Celeb Couples

From Miley Cyrus and Liam Hemsworth's undeniable chemistry to Kristen Stewart and Robert Pattinson's intense romance, these on-again, off-again celeb couples always have us on the edge of our seats when it comes to their current relationship status.
Click the video to see ET's top five countdown of Hollywood's hottest on-again, off-again couples!