Chloe Bailey Says Keeping Sister Halle's Pregnancy Secret Was Easy

Chloe and Halle Bailey have a bond that can't be broken -- which is probably why the older sibling here says it was no issue keeping her little sister's pregnancy a secret.

We caught up with sister duo at Essence mag's pre-Oscar gala on Thursday -- and Halle couldn't help but blush and gush about her newborn baby boy Halo, whom she shares with boyfriend DDG ... who was enjoying fatherhood as we spoke with Mama Bear.

Just check out the video DDG threw up recently ... showing him goofing around with the kid.

Anyway, back to Halle -- our photog asked if Halle's musical talents have transferred over to the baby just yet ... and based on her reaction, it sounds like it might be too early to tell.

So, instead ... we lobbed her a softball, asking how motherhood was going -- and HB told us it was great. Chloe, however, gave us a little more insight into her sister's pregnancy ... which sorta flew under the radar (although, not really).

Nonetheless, we asked Chloe if was difficult keeping everything under wraps for Halle -- and she told us it was actually a breeze. Halle herself addressed this as well during her remarks at the event ... and said she had no obligation to share her pregnancy with the world.