Meet Cosmo Jost : Colin Jost & Scarlett Johansson's Son and His Fun-Filled Life

February 6, 2025

Last updated on: February 6, 2025

Cosmo Jost is the baby boy of comedian and “Saturday Night Live” cast member Colin Jost and actress Scarlett Johansson. Born August 18, 2021, Cosmo became an instant fan magnet. We are going to learn who Cosmo is, his background, and other more interesting facts that you would like to know.

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Quick Facts About Cosmo Jost


Full Name	Cosmo Jost
Birthdate	August 18, 2021
Occupation	N/A
Husband/Wife	Not Married
Education	N/A
Age	3 years and 5 months old
Parents	Colin Jost and Scarlett Johansson
Siblings	Older half-sister: Rose (Scarlett’s daughter from a previous marriage)
Grandparents	Kerry Kelly, Daniel A. Jost, Karsten Johansson, Melanie Sloan
Net Worth	<$1 million

Background/Early Life

Cosmo was born in the year 2021 by his parents, Colin and Scarlett. Colin posted an Instagram post sharing the good news of Cosmo’s birth. He was born on August 18, and thus he is a Leo. His parents gave him the name Cosmo. It is derived from a flower belonging to the sunflower family. Colin’s mom was surprised at first, but she started loving it when she met others with the same name.

Colin Jost with his wife Scarlett Johansson — Colin with his wife Scarlett Johansson

Cosmo’s Family

Cosmo has a big, loving family. His mom is Scarlett Johansson. She is that famous actress that played Black Widow in the Avengers movies. His dad, Colin Jost, is a comedian and writer and has been a cast member of SNL for years. Cosmo also has an older half-sister named Rose. Rose is Scarlett’s daughter from her previous marriage to Romain Dauriac. Colin said Cosmo and Rose get along really well. They spend much time together and like each other’s company.

Sibling Relationship

Cosmo’s bond with his sister, Rose, is really very sweet. According to Colin, Cosmo refers to Rose as a “very nice, loving sister.” Both of them share a good bond, and the relationship between the two seems pretty strong. It is heart-warming to think that Cosmo has a sister who cares about him and has been there through all the different stages of growth.

Personality of Cosmo

Cosmo is half funny and half shy. Colin, his father, has mentioned that Cosmo is funny. He likes to make people laugh. At times, however, Cosmo gets a little shy, but at the same time, he’s very sociable. Colin has described him as a “gregarious little guy,” which basically means he’s friendly and loves being around others.

A three-year old Cosmo shows a great deal of charm and humor already. Even though he is a baby, somehow he has already given so many impressions and laughter through his funny moments.

Cosmo’s Swimming Skills

Colin Jost feels that swimming is the most important thing for Cosmo. He really enjoys taking his son to the pool whenever possible. Cosmo has already become a pretty good swimmer. In fact, Colin said that Cosmo is “almost independently swimming.” Pretty impressive for a three-year-old! Colin seems proud of how his son has grown in this respect as well and enjoys seeing him swim.

A Hilarious Moment

Cosmo may be young, but he already has a sense of humor. Colin once shared a funny moment with the world. Cosmo was having milk and said, “Some things in life you just have to savor.” This simple but wise remark shows that even at a young age, Cosmo has a fun way of looking at the world. It’s these little moments that make him such a lovable kid.

Source: celebs.infoseemedia.com