Leonardo DiCaprio and Erin Heatherton seen having lunch at Candela Candela in New York City on June 11,2012. Credit: TNYF/WENN.com

Still going strong!

Despite Leonardo DiCaprio's busy filming schedule (post-Great Gatsby filming, he headed straight to New Orleans for Quentin Tarantino's Django Unchained), he and girlfriend Erin Heatherton seem committed to going the distance.

On Monday, the duo lunched together at NYC's Candela restaurant -- and got caught staring lovingly at one another across the table. Last week, a source tells Us Weekly the pair also stopped by an event at NYC hotspot The Darby, where they were "inseparable all night."

"They showed up hand-in-hand," the eyewitness reveals. "They were acting like a couple all night!"

DiCaprio first stepped out with the Victoria's Secret model in December; prior to dating Heatherton, his last serious relationship was with Blake Lively, from whom he split last summer.