January 09, 2009 12:00 PM

James Devaney/WireImage

Who wants to watch basketball when you can have a tickle fight? Jon Stewart gets in a sneak attack on 4 ½-year-old son Nathan Thomas while attending the Boston Celtics vs. New York Knicks game on Sunday in Manhattan.

The Daily Show host, 46, and wife Tracey are also parents to daughter Maggie Rose, 2 ½.

Click here to see yesterday’s cutie!

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