We witnessed how serious Carmelo Anthony could be during the Rio Olympics, when he shot a mean mug to his USA Basketball teammates for singing Vanessa Carlton's "A Thousand Miles."

But why was the New York Knicks' All-Star so serious, while standing next to Jay Z and Beyoncé during the Made in America music festival on Sunday night in Philadelphia?

You be the judge.

Maybe Melo wasn't feeling the particular artist performing at the time.

Or maybe Hov told him the Knicks don't stand a chance during the upcoming 2016-17 NBA season.

Whatever it was, Melo was pretty serious ... on Beyoncé's birthday out of all days!

Hey, for what it's worth, he was smiling earlier in the day, while with his wife, La La.

Well ... kinda smiling.

Perhaps, he's just really ready for the new season to begin.

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