IR Blog Post 3 Twins on the way (3)

Facts:

1. 41 year old singer, Mariah Carey is carrying twins
2. Nick Cannon confirmed the news of his wife being pregnant on New York's 92.3 radio station
3. Carey had not told anyone before Nick shared this news to the world

http://marquee.blogs.cnn.com/2010/12/16/twins-on-the-way-for-mariah-carey-and-nick-cannon/

Questions:

1. Why did Nick decided to announce that his wife was pregnant on the radio?
2. Do they know the genders of the babies yet?

Link:
http://www.people.com/people/article/0,,20451078,00.html