Usher doesn’t seem to be feeling the effects of his messy split from Tameka Foster. After a performance at Haze on the Las Vegas Strip, the R&B singer parked at a banquette and was swarmed by females. “His table was literally overflowing with women,” says a spy. “They had to bring over additional security guards to manage the crowds.” Also slated to perform at the club are Katy Perry, Estelle and John Legend.