I don't know if this counts as "celebrity", but former football player Antonio Cromartie has a reality TV show about him and his family, and his cute wife is pregnant. (I only see five children on the show (six if you include the unborn baby), but apparently this guy has 14 children. Dude gets around.)
Related, but pregnant with twins in this video:
Related, but pregnant with twins in this video:
Movies with real pregnant bellies:
https://letterboxd.com/belliesrlovely/list/real-pregnant-bellies/share/O8XqXaBHPipuZmCL/detail
https://letterboxd.com/belliesrlovely/list/real-pregnant-bellies/share/O8XqXaBHPipuZmCL/detail