Jenna's female impersonator boyfriend Paul (played by Will Forte) appeared on 30 Rock again in last night’s episode. Mid-show, he was in roller skating waitress drag working with other roller skating "waitresses" and later he appeared as a black swan à la Natalie Portman (see photo with Jenna, played by Janet Krakowski, as Lynn Swann).
You can watch the whole episode here until January 7, 2011.
Also, on the 30 Rock web site is a short video titled Mrs. Lutz on Lutz, in which Mrs. Lutz shares all of her son's embarrassing secrets. Her son, J.D. Lutz, is one of the writers on the fictional Saturday Night Live-like television show that 30 Rock documents. Mrs. Lutz is played in drag by the actor, John Lutz, who plays J.D. Lutz (see photo).