During an appearance on The Drew Barrymore Show, the 81-year-old took part in a game called "Red Flag, Yellow Flag, Green Flag," where Barrymore gave the names of three celebs to choose what colour flag they would be.
(The red flag means "no", the green means "yes" and yellow is somewhere in between those answers).
It's not the first time Stewart has said this, previously describing him as "like the son I never had" in response to dating memes about her and Davidson that went viral after the comedian split from Kim Kardashian.
One of those tweets shows a photo of Stewart holding hands with Davidson who is next to Kardashian at the White House Correspondent's dinner with the caption "We should've seen this coming."
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