Ashton Kutcher Tells Mila Kunis "I Love You" During NYC Date

Mila Kunis and Ashton Kutcher in Central Park in New York City on September 17, 2012. Credit: Tom Meinelt/Splash News

Autumn may have arrived in NYC, but things are still heating up for Mila Kunis and Ashton Kutcher.

On Monday, the couple of about six months had a romantic lunch date at Bistro Chat Noir after a hang out in Central Park. As Kutcher, 34, paid for the bill, he said "I love you" to his former That 70s Show costar, 29, an observer tells Us Weekly.

Indeed, after playing coy about their relationship for months, Kutcher (who split from wife Demi Moore in November 2011) and Kunis (she and longtime love Macaulay Culkin broke up in late 2010) have been on a veritable PDA parade lately.

Before their Bistro Chat Noir lunch, they were photographed holdings hands -- and then taking a breather on a boulder in Central Park, where they were snapped kissing passionately.

"Ashton and Mila are totally together and loving it," a source close to the couple tells Us. "He always had a thing for her and he finally made it happen . . . It is real infatuation right now."