Shawn Mendes goes on a hike with his alleged girlfriend, Dr. Jocelyne Miranda

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Shawn Mendes could really be on the rebound...because he was spotted once again with his possible new señorita while the two of them were training.

Shawn, 24, was all smiles - and shirtless - while hiking with Dr. Jocelyne Miranda, 51, at Runyon Canyon Park in L.A. on Monday ... chatting as they sweated it out.

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Jocelyne was then spotted wearing a sweatshirt that read 'I love you baby' - and while people can connect the dots all day, it may still be too early to tell if this adventure is legit.

For those who don't know, Shawn fans have been pinning the two as an item for a while now...after they were spotted together last year on a rumored lunch date, and were seen from time to time. in time since.

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