It's a younger Mark Ruffalo!

It's...honestly, nobody actually knows, because apparently they look the damn same!

"Are you aware of the comparison that people are making between you and Noah Centineo?" Jimmy Fallon asked Mark Ruffalo on Wednesday night's episode of The Tonight Show.

When Ruffalo looked flabbergasted by the question, Fallon pulled out a photo of the 22-year-old To All the Boys I've Loved Before actor.

"I wish I was that good-looking," Ruffalo-who's making the rounds to promote Avengers: Endgame-told the host.

Fallon's gag didn't come out of nowhere. On social media, fans have been pointing out how much Centineo looks like a younger Ruffalo.

ok I was looking at pics of younger mark ruffalo and dude...he and noah centineo are so similar its uncanny - ala (@lorenshaIes) September 7, 2018

the day mark ruffalo and noah centineo meet and post a father/son reunion video is the day the internet will break - saw cm | 112 (@hollenhaal) August 26, 2018

Throughout the Tonight Show segment, Ruffalo was pretty resistant to the idea of them looking alike-even when Fallon played a video clip of Centineo acknowledging their resemblance. But finally, on Thursday, Ruffalo joined in on the fun by sharing a #TBT tweet-with a photo of Centineo.

#TBT - Mark Ruffalo (@MarkRuffalo) March 14, 2019

Hey, if you can't beat 'em, join 'em. At least it's a compliment.