Ashton Kutcher and Mila Kunis in NYC. Credit: Splash News and Pictures

Still going strong after five months!

Ashton Kutcher and Mila Kunis have recently been parading their relationship around NYC. The 34-year-old actor, still separated from Demi Moore, has been living with his onetime That '70s Show costar, 29, while she films The Angriest Man in Brooklyn in the city.

"He always had a thing for her," a source told Us Weekly. "It's a real infatuation."

On Sept. 17, the pair of five months fed each other brunch across the table at NYC's Philip Marie restaurant -- then cuddled up on a boulder for an extended smooching session in Central Park.

"They only saw each other," a witness said of the duo. "Nothing else seemed to matter."

While a source told Us that Kunis "isn't sure this will last," the Friends With Benefits actress is "going for it."