Bush 41 received a standing ovation after he was introduced by announcers during the bareback riding competition.
NRG Stadium erupted in applause for the 93-year-old former commander-in-chief.
Bush was there to help celebrate the final night of the 2018 Houston Livestock Show & Rodeo.
PHOTOS: George H.W.Bush rocks RodeoHouston
On February 27, Garth Brooks opened the rodeo to long lines as more than 75,000 came to watch the country superstar.
Once again, a sold-out crowd is at NRG to see him close RodeoHouston on the star-shaped stage.
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