It was a long night out for some of the city’s biggest A-listers, who seem to be forming a modern-day Rat Pack. Leonardo DiCaprio was spotted hanging out with Axl Rose at Catch Roof on Monday at a table along with Tobey Maguire, Jonah Hill and Michael K. Williams. “They were seated at a VIP table surrounded by tons of security,” says a spy. “They looked like a modern-day Rat Pack.” Earlier, another witness saw Rose enjoying dinner at the eatery with “a harem of ladies,” and was overheard discussing plans to, somewhat alarmingly, “buy a tiger.” After midnight, some members of the group, including Maguire and Hill, headed to Avenue, where Ray Liotta, Danny Abeckaser and a number of the cast from “The Iceman” came for the after-after- party for the film’s screening. Also at the Chelsea club were Kid Cudi and Jamie Foxx, who a spy says, “was dancing like Michael Jackson to DJ Ross One.” Another spy said Maguire and Hill, who requested hip-hop songs from the DJ all night, “had Jamie rapping along.”