Colin Kaepernick & Vernon Davis -- 49ers Team Bonding ... With Bikini Model

With their team in peril, nothing brings a quarterback and a tight end together like a photo shoot with a hot Sports Illustrated bikini model.

SF 49ers QB Colin Kaepernick and Vernon Davis hooked up with Samantha Hoopes for a photo shoot for Levi's jeans ... and despite the crappy weather, Hoopes looked like she was ready for the beach.

As for Colin and Vernon, it looked like there was some friendly competition for Sam's attention -- and they even threw some friendly zingers at each other.

It doesn't appear Samantha has a BF ... but it seems she has a thing for football players ... and Colin happens to be single.