The reality star and professional dancer van Amstel danced the foxtrot to 'Yankee Doodle Dandy' during Monday night's American-themed episode.
"The landmark 1,000th competitive dance will be performed by Kendra and Louis," announced co-host Tom Bergeron ahead of their routine, which saw red, white and blue streamers released across the studio and a siren blaring.
"We're nothing if not understated!" joked Bergeron.
The current season of Dancing with the Stars, which premiered last month, marks the 12th outing for the ABC competition, which launched back in 2005.
Tonight's results show will see another couple sent home from the dancefloor, while the American theme continues with a performance by Toby Keith.
The country star will sing 'American Soldier' (accompanied by dancers Anna Trebunskaya and Jonathan Roberts) and 'Should've Been A Cowboy' (accompanied by Maksim Chmerkovskiy, Lacey Schwimmer and the Dancing with the Stars Dance Troupe).
Dancing with the Stars airs Mondays and Tuesdays on ABC.
> Read our full Dancing with the Stars recap here