AceShowbiz -

Jon Hamm was spotted for the first time since he and his girlfriend Jennifer Westfeldt ended their 18 years of relationship. The 44-year-old actor was photographed enjoying a dinner with male pals at Little Dom's restaurant in L.A. on Thursday night, September 10.

Jon was seen greeting one of the guys with a friendly hug before being seated at one of the restaurant's outdoor tables. The "Mad Men" alum wore a baseball cap, a black shirt paired with beige trousers and brown sneakers with white soles. He and his friends kept it low-key and seemed content to just catch up over dinner.

Jon and Jennifer announced their separation in a statement to PEOPLE earlier this week. "With great sadness, we have decided to separate, after 18 years of love and shared history," the former couple said, "We will continue to be supportive of each other in every way possible moving forward."

Jon began dating Jennifer in 1997. The pair starred together in 2011's movie "Friends with Kids". They were last seen together at the after-party for the "Wet Hot American Summer: First Day of Camp" premiere in New York City on July 22.