Pop diva Whitney Houston is driving Arista execs crazy while she wraps her new album. She's been in the studio day and night, putting the finishing touches on it, and Arista is going nuts. The problem, say the source, is the album has to be shipped to stores by Nov. 17 to make the holiday selling season - that's when record companies sell 35 percent of their albums. Another insider confirmed, they've totally scrambling to get it out in time. It's stressing everyone out.