Pop superstar Madonna will make her episodic TV series debut in May on NBC's ''Will & Grace.'' She's just one of the big names being called on by the sitcom to juice up ratings during ''sweeps'' months, which are used to help set local advertising rates.
Demi Moore and Minnie Driver also will guest star on ''Will & Grace,'' NBC said Friday. In February, Moore will play a former baby-sitter to Jack (Sean Hayes), who meets up with him again. In another episode, Driver plays a woman who romances Karen's former husband and then really makes Karen (Megan Mullally) angry by befriending pal Jack.
Details of Madonna's appearance and specific episode dates have not been announced.