Ryan Reynolds and Blake Lively shacked up together at a bed and breakfast in Utah the other day ... AND TOTALLY MADE OUT!!!

It all went down over Thanksgiving weekend ... saliva was exchanged, embraces were shared ... and they probably banged the hell out of each other. 

Ah, romance.

Possibly dating former co-stars Blake Lively and Ryan Reynolds were spotted this morning outside Ryan's apartment in Boston, MA.

Let's hope their relationship has a longer shelf life than "Green Lantern."

Blake Lively had angst all over her face Thursday ... as she cruised the canals in Venice, Italy with Leonard DiCaprio -- the first time she was photographed since those nude photos hit the Internet.



It appears Blake was using an iPhone 4 on the boat ... an upgrade from the old iPhone featured in the naked pics ... especially when it comes to the camera feature.

We got the photo evidence Leonardo DiCaprio and Blake Lively were absolutely, positively ... at the same party in France! So, Leo's definitely dating her ... or some other woman.



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Blake Lively and Penn Badgley know breaking up is hard to do ... when you work together.



For the first time since news broke of their breakup, the former couple was spotted smiling and embracing on the NYC set of "Gossip Girl" today.

XOXO ... but only on-camera.