The retired Patriots superstar is staying active on his NFL Sundays ... teaming up with his bikini model lady, Camille Kostek, for a public workout at the Boston Seaport with his family's Gronk Fitness business.
The workouts are great and all ... but we're 100% here for the hot couple getting down and GETTING IT to BSB's "Everybody (Backstreet's Back)" ... while the whole crowd cheers them on.
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The Patriots didn't need Gronk in their 43-0 domination over the Miami Dolphins ... and Gronk sure as hell didn't need the Pats to have a good time, either.
Of course ... maybe the 30-year-old is using BSB to send us a message -- if Backstreet's back, does that mean Gronk could be coming back too??
As entertaining as it was to watch Rob on the field, this tames our Gronk appetite on Sundays. For now.