A spokesperson for Garner, 31, tells Us that Vartan and Garner "were friends, and they recently started dating." Sources tell the mag that they've been dating since the ABC show resumed taping two weeks ago, usually spend the night together and that Vartan, 34, has been in love with his co-star for years.
But rumors have been swirling about Garner and the French actor since the breakup of her marriage.
Love also had been growing between their Alias characters, but that's on hold now that Garner's character has mysteriously lost two years out of her life. During that time, Vartan's character got married.
Garner and Foley, 31, married in October 2000; they met when she did three 1998 guest spots on his show, Felicity.