Despite being linked to Franco, 34, after splitting from actor Josh Hartnett, 34, the 26-year-old star of Lovelace was spotted on a date with Harrington, 35, and friends in Hollywood, Calif. on Wednesday night.
According to multiple eyewitnesses, the pair looked very cozy at low key watering hole, The Pikey.
“They were holding hands and he had his arm around her,” one onlooker told Celebuzz.
“At one point, he even leaned in for a passionate kiss. They looked very into each other.”
Keeping a low profile, Seyfried — who also starred in Mamma Mia! — arrived with two male friends and Harrington and took their seats at a back booth, the source said.
“They were definitely trying not to be seen,” a second source said.
“Desmond even kept his baseball cap on and the group picked an out of the way table to enjoy some drinks and dinner.”
How did they meet?
Though we don’t have any confirmation, the new couple does have a mutual friend in common – Dexter leading lady Jennifer Carpenter – who was recently photographed hiking with Seyfried in the Hollywood Hills.
Harrington stars as a detective in the hit Showtime series with Carpenter.
It was previously reported that Franco was pursuing the 26-year-old actress and was even spotted last month coming out of her L.A. home.
The two are co-stars in the upcoming Lovelace movie; Seyfried plays the title role as porn star Linda Lovelace while Franco plays Playboy founder Hugh Hefner.
Seyfried has most recently dated Hartnett, after splitting from real estate broker Justin Huchel.
Prior to that, Seyfried dated real estate executive Andrew Joblon, had a high profile fling with Ryan Phillippe and a long term on-and-off again relationship with her Mamma Mia! co-star Dominic Cooper.
Seyfried and Harrington’s reps did not respond to Celebuzz’s request for comment on the pair’s new relationship.
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