Mariah Carey and Nick Cannon have 15-year-olds! The superstar parents are celebrating their twins, Monroe and Moroccan Cannon, this week. Both parents shared sweet social media messages honoring their mini-mes' birthdays. The celebration comes just after Nick admitted in an interview that he'd be open to more kids with Mariah if she asked. RELATED: Mariah Carey And Her Twins Steal The Spotlight In Easter Flick & Fans Can't Get Enough (PHOTO) Mariah Carey & Nick Cannon Celebrate Twins' 15th Birthday On April 30, Mariah Carey shared photos and videos of her twins on Instagram.