Credit: Will & Grace: Chris Haston

Memorable ”Will & Grace” guest stars: Madonna

The mercenary nature of the Will & Grace guest spot has never been more apparent than in Madonna’s appearance, timed to coincide with the promotional push for her 2003 American Life album. On the sitcom, Madonna played Liz (the name is an apparent homage to Madonna’s longtime publicist, Liz Rosenberg), an eccentric woman who briefly takes on Karen (Megan Mullally) as a roommate. It’s not a performance that’ll erase memories of Swept Away or other bad Madonna acting — the singer delivers her lines as if in a trance, with her eyes half-lidded — but it’s weirdly compelling just the same. Plus, Madge proves a good sport: She lets Mullally fondle her breasts.