"The Ellen DeGeneres Show" kicked off its Season 15 premiere on Tuesday with a game of "Does Daddy Really Know Best?" -- Ellen's take on "Are You Smarter Than a 5th Grader" -- starring Mark Wahlberg and Will Ferrell.

The "Daddy's Home 2" duo competed against 11-year-old Zachary Rifkin, who happens to be a straight-A student in the gifted program at his middle school in Calabasas, California.

The subjects of the game included astronomy, math and even some Gwen Stefani. Rifkin destroyed the comedic duo on naming the number of bones in the human body, the number of legs on a butterfly and the sum of four-sevenths and one-sixteenth.

The funnymen were quick to name the correct number of sides of a heptagon, to which Rifkin quipped, "Enjoy it while you can. That's the only one you get."

In the end, Wahlberg and Ferrell proved they were not smarter than Zachary. The final score was 4 to 3.

See the hilarious clip above.

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