16 celebrities you probably forgot guest-starred on 'Will & Grace'

NBC‘Will and Grace’ had a lot of great guest stars.
  • “Will & Grace” is on its final season, but even before it was rebooted the sitcom featured a ton of famous guest stars.
  • Alec Baldwin once appeared on the show as a guy who was definitely interested in Karen.
  • Musicians like Demi Lovato, Elton John, and Britney Spears also appeared on the sitcom.
  • Visit Insider’s homepage for more stories.

After returning to NBC in 2017, the hit sitcom “Will & Grace” is now on its final season.

But even before the show was rebooted, it featured an impressive parade of guest stars who popped in and out of episodes over the series’ initial eight-season run.

Here are all of the celebrities you forgot guest-starred on “Will & Grace.”

Madonna was almost Karen’s roommate.

NBCMadonna apparently did not know Debra Messing’s real name.

In 2003, Madonna appeared on “Will & Grace” and was almost Karen’s new roommate.

While on “The Graham Norton Show,” Debra Messing, who plays Grace, said that Madonna sent her flowers after filming, but the singer was unsure of Messing’s name so the bouquet was addressed to Rachal.

Candice Bergen played herself.

NBCCandice Bergen was known for her role on ‘Murphy Brown.’

Candice Bergen played herself in the series, but she was Karen’s (Megan Mullally’s) rival, with many references being made to the pranks she and the “Murphy Brown” actress would play on each other through the series.

Bernadette Peters played Karen’s sister.

NBCBernadette Peters appeared on season eight.

On season eight, “Smash” star Bernadette Peters appeared as Karen’s little sister, Gin, who was injured as a child, so Karen supports her financially.

Even though Peters blamed Karen for her accident, she was actually the one who was trying to injure Karen.

Patrick Dempsey played one of Will’s love interests.

NBCPatrick Dempsey is known for his role on ‘Grey’s Anatomy.’

Long before he was McDreamy on “Grey’s Anatomy,” Patrick Dempsey appeared on the show during season three to play Will’s (Eric McCormack’s) boyfriend.

Alec Baldwin played a guy who was definitely into Karen.

NBCAlec Baldwin appeared on the revival, too.

Alec Baldwin is a popular guest-star choice for many NBC sitcoms – and “Will & Grace” is no exception.

On the original series, Baldwin played one of Karen’s love interests, and he even reprised his role in the revival a few years later.

Ellen DeGeneres played a nun.

NBCEllen DeGeneres appeared on season three.

On a season three episode called “My Uncle The Car,” Ellen DeGeneres played a nun who bought Grace’s uncle car – and had a dream of starting a cheesecake business of her own.

Natasha Lyonne worked for Grace.

NBCNatasha Lyonne played an intern.

Natasha Lyonne is known for playing Nicky Nichols on “Orange Is the New Black,” but on “Will & Grace,” she played Gillian, an intern who worked for Grace in her interior-design office.

Gene Wilder was Will’s boss.

NBCGene Wilder won an Emmy for his wacky performance.

During season five, the late Gene Wilder played Will’s boss, Mr. Stein. Not only did he score an Emmy for his role, but also it was his last on-screen appearance before his death 13 years later.

Britney Spears played a pundit.

NBCThis is not the only TV show Britney Spears has made a cameo on.

In 2006, Spears played Amber-Louise, a right-wing pundit on Jack’s (Sean Hayes’) talk show on OutTV who was actually secretly a lesbian named Peg.

Demi Moore was Jack’s childhood babysitter.

NBCDemi Moore on ‘Will & Grace.’

Demi Moore played Sissy, Jack’s babysitter as a child who, unsurprisingly, remained Jack’s babysitter well into adulthood.

Eventually, Will convinced Jack that he no longer needed a babysitter, so he had to let Sissy go, which was heartbreaking for him.

Matt Damon was Jack’s rival.

NBCMatt Damon played a chorus member.

During season four, Matt Damon played Owen, Jack’s rival in the New York City Gay Men’s Chorus.

As The Telegraph pointed out, the show featuring Matt Damon was one of the series’ most-watched episodes of all time.

Elton John played a member of the “gay mafia.”

NBCElton John on ‘Will & Grace.’

The legendary Elton John played a member of the “gay mafia,” and Jack thought that he (and the rest of the mafia, of course) was coming after him.

Kristin Davis was Vince’s version of Grace.

NBCKristin Davis’ character hated Will.

Former “Sex and the City” star Kristin Davis guest-starred on “Will & Grace” as Nadine, the best friend of Will’s boyfriend, Vince.

Unfortunately, she hated Will … and after she had the chance to get to know Grace better, it was obvious that she had ulterior motives.

Neil Patrick Harris was a “former gay man.”

NBCNeil Patrick Harris on ‘Will & Grace.’

During season two, Neil Patrick Harris played Bill, who identifies as a “former gay man” who tries to make Jack straight.

The episode mocked the disproven idea of “gay conversion therapy,” a topic later revisited in the revival.

Demi Lovato appeared on the reboot as a surrogate on the show’s reboot.

NBCDemi Lovato is a musician.

In 2020, the musician appeared as Jenny, a surrogate for Will. Her character lived in a sloppy apartment that Will simply could not stand.

Nick Offerman played a plumber.

NBCNick Offerman is married to Megan Mullally in real life.

Since he’s Megan Mullally’s real-life husband, Nick Offerman unsurprisingly and hilariously appeared on “Will & Grace” as Nick the Plumber.

He also guest-starred on the reboot, this time as Jackson Boudreaux, a celebrity chef.

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