On TV, Jon Hamm may play cheating hubby Don Draper to perfection, but when it comes to his longtime offscreen love, Jennifer Westfeldt, sources insist he’s totally devoted to her. “He caters to her every whim,” says a source close to the star of AMC’s Mad Men, 39, who was spotted hand in hand with Westfeldt, 40, at a March 3 Vanity Fair pre-Oscar bash. Another pal tells Us, the actress does a fair share of doting on her Golden Globe winning guy. “Jennifer is thrilled with Jon’s success,” says the pal. “They are very supportive of each other and very affectionate.” And when something works so well, the duo are in no rush to change it. “People always ask them if they’ll get married, but they have no plans,” says the friend. “After more than 10 years, they’re still happy with the way things are.”

Next to their picture together is the question – Any kids in their future? “We’ll see,” Westfeldt tells Us. “Our dog is the light of our lives.”