last week she is expecting her second child at 46. >> when it comes to motherhood these days is 40 the new 30? >> my biological clock is ticking like this! >> reporter: it is the 1990s movie scene so many women could relate to. a 30-something marissa tomei and my cousin vinnie worried she was getting too old to conceive. at 46 halle berry announced she is pregnant with her second child calling it the biggest surprise of my life. and actress kelly preston -- >> it was basically a miracle. >> reporter: she was 47 when she welcomed her third child into the world with husband john travolta. ♪ my baby >> reporter: mariah carey had her babies at 40, the same age at which nicole kidman had a kid of her own. >> celebrities want a healthy career, family life in general. so once the career is in place, an obvious shift would be to look at the family.