Kanye West's ex-giflriend of two years moved on pretty quickly after their breakup and has been engaged to Wiz Khalifa ever since.  Well, Wiz and Amber Rose welcomed their son Sebastian Taylor Thomaz yesterday (February 21st). Wiz wrote, "Happy Birthday Sebastian 'The Bash' Taylor Thomaz!!! Everyone welcome this perfect young man into the world." The couple previously said that Amber would have a natural water birth at home.