Mitchell Souter wrote to the remake of cult TV show Jim'll Fix It, which aired on BBC1 on Boxing Day, asking to join the Formula One star's team.
He was thrilled when his wish was granted.
The 12-year-old was taken to Goodwood for filming on December 9 but had no idea Lewis Hamilton would actually be there until he arrived.
Mitchell, who goes to Altwood CE School in Maidenhead, has been racing cars himself since he was 10.
He joined Hamilton as a passenger in his McLaren MP4-12C which they raced at speeds of up to 170mph.
Jim'll Fix It with Shane Richie was made in tribute to original presenter Sir Jimmy Saville, who died in October.
The youngster was given a Jim'll Fix It medal, a signed replica Lewis Hamilton helmet and a framed photo from the day.
See tomorrow's Advertiser for the full story.
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