Silverman and Kimmel on Oct. 3
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"They're taking it slow," says a source. "They're on the road back to being together again."
The comedians, who ended their five-year relationship in July, have recently been spotted on dates on both coasts.
On Sept. 28, Kimmel, 40, and Silverman, 37, enjoyed a laughter-filled dinner together at L.A.'s Pattaya Thai Restaurant, says a source, and left holding hands.
Less than a week later, they attended pal Howard Stern's Oct. 3 wedding at New York City's Le Cirque restaurant, where Kimmel was spotted wrapping his arms around Silverman's waist and playfully grabbing her backside in plain view of photographers.
Reps for the comedians had no comment.
Silverman thanked her ex from the stage after winning an Emmy last month for her salty music video "I'm F------ Matt Damon," which first appeared on Kimmel's late-night talk show before becoming an internet sensation.
"Thanks to the person for whom this whole video was made: Jimmy Kimmel, who broke my heart – ohh, who'll always have a place in my heart," she said.
The new season of her show The Sarah Silverman Program premieres on Comedy Central this week.
• With reporting by DIANE HERBST and CYNTHIA WANG
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