Whitney Houston begins in earnest to record her comeback album today. Houston, who's been in rehab for about a year in Southern California, is about to make the tentative steps toward reclaiming her once-flourishing career. The first step is venturing into a recording studio with superstar writer-producer Johnta Austin — pronounced "Jon-tay." Austin won a Grammy for co-writing Mariah Carey's hit "We Belong Together." The hope is that he can work his magic again with Houston. I already told you in this space about a month ago that music mogul Clive Davis has already settled on roughly seven songs for...