Alexis Bledel and Vincent Kartheiser shared an ill-fated affair on ‘Mad Men’ last season, but off camera the couple are celebrating their engagement! Bledel’s rep has confirmed the news to US Weekly. “They couldn’t be happier,” a friend of the ‘Gilmore Girls’ actress said.

Alexis, 31, and Vincent, 33, began dating since early last year. Bledel played a mentally imbalanced housewife who had an affair with Vincent’s character, Pete Campbell.

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Says another friend: “Vincent proposed a few weeks ago. She’s been wearing her ring. It’s huge!” In the past, Kartheiser has been linked to actress Rachael Leigh Cook; Bledel dated her Gilmore Girls costar (and on-screen love interest) Milo Ventimiglia for more than three years.

“They are so cute together!” another source tells Us of the spouses-to-be. It will be the first marriage for both, who attended the October nuptials of Bledel’s Sisterhood of the Traveling Pants costar Amber Tamblyn and David Cross.

Congrats to the couple! I wonder if Alexis’ character will be back this season on ‘Mad Men.’ What do you think? Will Pete move on – maybe be happy with his own wife again?

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Tags: Alexis Bledel, celebrity, couple, Engaged, Hollywood, Mad Men, Vincent Kartheiser