Socialite Kim Kardashian has revealed that she is no hurry to have kids of her own and that her nephew, Mason, from big sis Kourtney, is the best birth control. Kim, 29, joked about it on Ryan Seacrest’s KIIS-FM radio show on July 22, though she had previously said on an episode of ‘Kourtney & Khloe Take Miami’ that she just can’t wait to have a baby like him. “Let’s just say Mason is the best birth control ever!†Us magazine quoted her as saying. “I’m definitely happy to wait awhile,†she added.