Jennifer Lopez had to keep a watchful eye on her kids ... sorry ... her boyfriend while he tooled around town on his cool new gadget.
Casper Smart and JLo were hanging in the Hamptons, and while his dog and Jennifer hoofed it -- Casper was cruising on one of those motorized boards.
At least he carried the shopping bags on the way home.
Despite the adorable Boxer pooch and Casper's toy -- the real star in this pic is still JLo's legs. God bless America, indeed.