Megan Fox and Machine Gun Kelly are in full holiday truce mode -- teaming up for some cozy family time with their little one ... proving these exes still roll as a unit when it counts. Backgrid

The pair was spotted wandering through the dazzling L.A. Zoo Lights Wednesday, taking in all the glowing displays -- and MGK was carrying their baby girl, Saga Blade Fox-Baker , in a chest carrier like a total doting papa.

Megan looked just as upbeat, strolling beside him with the pram -- giving full picture-perfect fam vibes as they stopped for pics and snapped selfies under those neon wings. Backgrid

And LBR ... there’s always been a spark between these two. MGK even recently claimed it was the evil eye that tore them apart last year -- with their baby girl arriving mo

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