LeBron James Mercilessly Pelts Kids at Son's Birthday Party with Water Balloons

LeBron James is still in championship mode...even at his son's birthday party.

The Cleveland Cavaliers star joined in the fun at Bryce Maximus' sports-themed 10th birthday bash Saturday and didn't appear to hold back while playing with the kids. 

In addition to unleashing speed-toss water balloons during a water-balloon tournament, James also hit the court...and flexed his dunking skills while he was at it:

Update: Sunday, June 18, at 10:25 a.m. ET

On Sunday morning, LBJ posted a video of the party. It included the water balloon fight—apparently started by the King and his wife, Savannah Brinson—and some pick-up hoops and football.

James fired balloons, flushed several dunks and Moss'd a few kids on the gridiron.

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[Instagram]