Lucy and Riley, who have been enjoying the sights of New York for the past month, spotted sisters Kylie and Kendall along with their mum Kris Jenner in Manhattan.
Kylie, Kris and co, who were filming for Keeping Up With the Kardashians, were joined by a ton of onlookers, and Riley soon got in on the action as she started snapping away at the famous family!
Posting a photo of 16-year-old Kylie and 58-year-old Kris crossing the road, Riley said: "Just saw kylie and kendall Jenner - they are hawt. Daym."
Lucy also tweeted about the moment, saying: "Just saw the kardashians getting bombarded by paps. Their lives are crazy."
The worlds of Made In Chelsea and Keeping Up With the Kardashians aren't too far apart though. Not only are they both reality shows, but thanks to MIC's New York spin-off, they're both shot in the States!
Lucy and Riley joined their cast mates in New York from May to film Made In Chelsea: New York, which will be comprised of six, one-hour episodes.
Viewers will get the chance to catch up with some of SW3's most famous residents, and we can't wait to find out what drama has followed them!
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MIC: New York trailer below: