Lovebirds Leonardo DiCaprio and Erin Heatherton saw the romantic musical “Once” Tuesday night after it cleaned up with eight Tony Awards over the weekend. The two were spotted with DiCaprio’s acting coach Larry Moss, and they headed afterward to theater haunt Joe Allen, where the “Django Unchained” star and the Victoria’s Secret model shared a La Scala salad and pasta with a side of spinach, spies said. DiCaprio will be in New York this summer shooting Martin Scorsese’s banker drama “The Wolf of Wall Street.” The film marks the duo’s fifth together, and Scorsese opened up this week, saying he first discovered DiCaprio through acting icon Robert De Niro. “I first heard about Leo from [De Niro],” the “Hugo” director says in a new interview with Parade.com. “He told me in passing, ‘I just did this thing called ‘This Boy’s Life’ with this kid named Leo DiCaprio. He’s really good. You should work with him some day.’ And he rarely says that. He’s always really kind about other people, but he rarely says I should work with somebody.”