J.Lo’s Pregnancy SpoilerJennifer Lopez will supposedly announce that she’s pregnant during her show at MSG on Saturday night. Jessica Simpson’s people say she didn’t drink and dash at the Box — her friend just accidentally took the receipt slip with him. Rosie O’Donnell did an impromptu ten-minute stand-up set during a show by Roseanne Barr at Comix. (Rita Crosby was there, despite having been served a subpoena earlier in the day.) Mariah Carey doesn’t know how many bathrooms are in her Tribeca penthouse. Howard Stein, the nightlife honcho behind eighties hangouts Xenon and Rock Lounge, died at 62. The Port Authority says the quality of its toilet paper is much improved, contrary to what Larry David said on last week’s episode of Curb. GLAAD forced “Page Six” to apologize for calling the pre-op transsexual who has a reality show on Fox a “she-male.”