Eddie Murphy's GF Paige Butcher in 2nd Trimester ... of HOTNESS!

Eddie Murphy is in rehearsals for "Daddy Day Care," Part 9 -- and his pregnant co-star's totally ready for her close-up.

Eddie and gf Paige Butcher took a stroll for java Wednesday in L.A. The couple announced they were expecting back in November ... so, we're guessing she's about 5-6 months along.

This will be the ninth spawn for Murphy and her first.

Her belly's bulging but you can tell, Paige is still holding on to that bikini bod. Motherhood is a beautiful thing.