Gisele Bundchen and her jiu-jitsu instructor are getting close once again -- this time, the two were seen riding horses in Costa Rica, in what's either an amazing just-friends date ... or further proof the two are now an item.
Tom Brady's ex and Joaquim Valente were spotted on the animals back on Jan. 18 ... and the duo looked like they had a blast.
The couple(?) rode the horses for roughly two hours through the jungle -- and check out Gisele's grin, she sure seemed giddy while plodding through the afternoon with Valente.