Daryl Sabara -- I Spy ... A Dear Future Husband (PHOTO)

Daryl has resurfaced ... dating Meghan Trainor.

Daryl and Meghan came out of the shadows hand in hand Tuesday at LAX, and our intelligence tells us they've been talking for a while on social media.

Daryl joined Meghan on tour for a bit last month, with the new couple posting pics of each other back and forth ... a lot.

Looks like agent Sabara is back from behind enemy lines ... enjoying all that bass.