'Will & Grace': Karen Mistakenly Thinks Will Is Grace's Baby Daddy in This Sneak Peek (Exclusive)

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Does Grace know who her baby daddy is?

On Thursday's episode of Will & Grace, titled "Pappa Mia," the mother-to-be (Debra Messing) endures a surprising response by her best girlfriend, Karen (Megan Mullally), after Grace admits she isn't sure who the father of her baby is. Naturally, Karen -- always one to think outside the box -- dreams up a Mamma Mia-inspired situation so Grace can identify the potential baby daddy.

But before Grace meets her men, she has to get through Karen's reaction to her pregnancy. And it's a doozy.

In ET's exclusive sneak peek, Karen can't contain her laughter after learning of her friend's new bundle of joy as she holds a cup of iced coffee in hand as she lounges at her desk.

"It's not funny Karen!" Grace tells Karen.

"Grace, you're pregnant! It's hilarious," Karen pipes back, before she asks if their other friend is aware of Grace's good news. "So, have you broken the news to Will yet?"

"Yup and he's having a baby too!" Grace responds, but Karen misunderstands, mistakenly thinking that Will is the father to Grace's unborn baby.

"That's how it works. When a gay man loves his hag very, very much...," Karen begins to say, before Grace cuts her off.

"No, no... this isn't Will's baby," Grace says, before Karen comes back with a memorable quip. Watch ET's exclusive sneak peek above. 

In all seriousness, who is the likely father of Grace's child? Could it be her former beau Noah (David Schwimmer) or current lover Marcus (Reid Scott) or maybe someone else? Only time will tell.

The final season of Will & Grace will feature a handful of notable guest stars, including Demi Lovato and Billie Lourd.

Will & Grace airs Thursdays at 9:30 p.m. ET/PT on NBC.

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