9. Jennifer Garner and Michael Vartan

The chemistry between super-spy Sydney Bristow and Michael Vaughn on Alias was largely due to the off-screen romance between the two actors, Jennifer Garner and Michael Vartan. The two met while working on the show and began dating two years later. Although people loved their chemistry, they only stayed together for a year and announced their split in 2004.

Fans may have been concerned that their breakup would affect their on-screen relationship, but they didn’t have anything to worry about. Vartan revealed that they were best friends before they started dating, and as a result were able to push past the breakup and continue to work well together. Some rumors of a rekindling romance surfaced in 2018, but it never played out.