Miami Heat star Jimmy Butler and rookie Tyler Herro have had something of a big brother-little brother relationship all season.

Naturally, Butler saw fit to impersonate the rookie after Herro poured in 37 points in a Game 4 victory over the Boston Celtics.

Butler donned Herro's Whitnall High School (Wi.) jersey, strutting his way into Miami Heat practice with a certain swagger:

https://twitter.com/MiamiHEAT/status/1309223270185668623

Herro has had plenty of swagger — and then some — during Miami's playoff run.

The former Kentucky standout is averaging 16.5 points, 5.9 rebounds and 3.7 assists in the playoffs while shooting 37.8 percent from beyond the arc.

Herro was especially magnificent on Wednesday night, shooting 14-for-21 from the field and scoring 17 fourth-quarter points, almost single-handedly keeping Miami in the lead.

The youngster is now second behind Magic Johnson (42) for most points in a playoff game while 20 years old or younger.

Herro also had the highest-selling jersey after his standout performance:

Butler might have been the Heat's marquee addition this past offseason, but Miami has had that much more success because of the growth of guys like Herro.

“Big brother” had all the jokes for “little brother” after Herro's heroic night.

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