Pop star Celine Dion is having twins... sort of. The chart-topping diva — who is due to give birth to a son on Valentine's Day — revealed in an interview with Quebec's TVA television network on Sunday that she has a second fertilized embryo stored at a Big Apple fertility clinic to which she hopes to one day give birth. Both Dion's unborn baby and the frozen embryo were conceived with hubby/manager Rene Angelil through in vitro fertilization. "So, I have a twin," Dion said. "It is called a laboratory twin. Technically, it is called a twin. It does not mean they are identical twins, but they were conceived at the same time."