Just two weeks after Russell Simmons and wife Kimora Lee announced their separation, the 48-year-old has been enjoying a run of late nights that would put a younger man to shame. Last Monday, Simmons was seen exchanging numbers with actress-model Estella Warren at the “Angel Flight America” charity benefit at the Altman Building, after which he partied until closing at Butter with Richie Akiva. On Tuesday night, Simmons hung with Lindsay Lohan and crew at Downtown Cipriani, then later moved to G Spa in the Hotel Gansevoort. On Wednesday, Simmons returned to Cipriani and spent more time with Warren, who was there with friends. “He’s definitely going out in full force,” says a source close to Simmons. “He’s all about the yoga and the women.” Simmons had no comment.