Sources tell TMZ Jesse was not only present ... he was "incredible with both Sandra and Louis" -- and created a "healthy, loving and positive atmosphere."
Now get a load of the timeline. We're told the photos were taken March 9 -- two days after the Oscars ... and just a few days before the scandal broke.
So Sandra was apparently oblivious to Jesse's alleged affairs when the pics were snapped.
Alas, we've figured out what was really going on when a photographer was snapped carrying baby clothes into Sandra and Jesse's home on March 9.
Now, the million dollar question -- are there photos of Jesse and little Louis Bardo floating around? We're guessing since Jesse was there -- and at the time expected to co-parent with Sandra -- no way he wasn't in some of the shots. Interesting the way it ended up looking like a single mom shoot.