Pregnant Gisele Bündchen was glowing and showing during her Costa Rican escape with BF Joaquim Valente ... proudly flaunting her growing baby bump.

The Brazilian supermodel wasn’t flying solo -- she had her two kids with ex Tom Brady, 12-year-old Vivian and 14-year-old Benjamin, soaking up the Costa Rican vibes for a dreamy family day out with her man.

Gisele rocked a cropped white top, showing off her bump as the family cruised around, all smiles and good vibes.

The catwalk queen is gearing up for her first child with the jiu-jitsu instructor, and their recent outings have made it crystal clear -- they’re totally smitten!

Gisele's pregnancy first hit headlines in October, and we were told she was around 5 or 6 months along at the time.