Kirsten Dunst Has No Idea Who Saint West Is -- Watch the Funny Moment!

The actress might be the last person on Earth to know that Kimye had a baby!

Kirsten Dunst might be the last person on Earth to not know what Kim Kardashian and Kanye West named their son!

The Golden Globe-nominated actress partnered with Jimmy Fallon to play a game of Catchphrase against Will Smith and the Roots’ Tariq on The Tonight Show Friday.

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Dunst was doing well until she stumbled upon a phrase she had never heard of: Saint West.

“What is that?” the Fargo star said.

Dunst looked visibly confused before skipping to another card – which, ironically, was name dropper.

Considering Kardashian and West’s second child has been in the headlines non-stop since he was born last week, it’s pretty surprising that the 33-year-old actress hadn’t heard his name at all -- and from the audience’s giggles, everyone at The Tonight Show seemed shocked, too!

Kimye welcomed Saint into the world on Dec. 5, 20 days before his original Christmas due date, and let the world know his name on Monday. "To our fans: Kanye and I welcome our baby boy," Kardashian wrote on her app following the newborn’s birth. "Kim Kardashian West and Kanye West welcomed the arrival of their son this morning. Mother and son are doing well."

WATCH: Kim Kardashian Tweets About Breastfeeding

The mom of two -- Kardashian and West are also proud parents to 2-year-old daughter, North -- has been showered with gifts since returning home from the hospital. During her first live stream since giving birth, Kardashian showed off dozens of beautiful flowers that had been delivered to her mom’s house by her A-list friends.

The 35-year-old reality star later revealed that her favorite present came from Jaime King. Watch the video below to see what the gift was.