Played by Lisa Kudrow, Ursula is the name of the waitress who worked at the restaurant frequented by Paul and Jamie in Mad About You. Later, as part of a crossover with the sitcom Friends, Ursula was found to be the identical twin sister of Phoebe Buffay. Originally vapid, but generally unmalicious, Ursula evolved over the course of guest appearances into a deceitful, treacherous leech, who (among other things) starred in a porno flick using Phoebe's name. Phoebe and Ursula had quite a feud going between them; according to Phoebe, one reason for this was because "she was the prettier one".