Alexis Bledel and Vincent Kartheiser, whose characters had an illicit affair in the AMC series "Mad Men," are engaged.
This will be the first marriage for Bledel, 31, and Kartheiser, 33.
People and Us Weekly confirmed the news, and Bledel's pal told Us Weekly that "they couldn't be happier."
"Vincent proposed a few weeks ago. She's been wearing her ring. It's huge!"
Bledel, who starred in the beloved "Gilmore Girls" series, dated costar Milo Ventimiglia for three years before splitting in 2006. Kartheiser previously dated "She's All That" star Rachel Leigh Cook, but the couple called it quits in 2010.