"Vinny basically fell in love with Alexis while she filmed a three-episode cameo on Mad Men," a source told Life & Style.
"I did know he liked her from a very early point," he said of the courtship.
Pop Blend would like to wish the couple the very best as they delve into wedding planning and all the big decisions that need to be made when two households become one.
Their "Mad Men" characters had an ill-fated affair, but off-camera, Alexis Bledel and Vincent Kartheiser are excitedly celebrating their engagement, Bledel's rep confirms exclusively to Us Weekly.
And they've been acting since before they can remember, which makes for a very special personality.
It's not just that I thought they would look cute together."PHOTOS: Best TV couples of all time" data-reactid="28"PHOTOS: Best TV couples of all time He continued: "Even with all of Alexis's amazing qualities, I think that if she had not been such a good actress, he would not have been interested."Us exclusively broke news back in March 2013 that the costars got engaged after dating for a few months.