As opposed to... Madonna's love child? Why did the author see a need to explain that yes indeed, the father of baby is the same person as the husband? How do they really know this?
maybe because she was pregnant before they married... they might want to let us know that they did finally get married... they eloped, so it might not be common knowledge...
Gwyneth Paltrow, the beautiful, blond Oscar-nominated heroine of "Shakespeare in Love," is descended from a distinguished rabbinical dynasty, called Paltrowitch, which may stretch back to 17th-century Russia. According to the London-based Jewish Chronicle, the actress can count 33 rabbis among her ancestors on her father's side. Her great-great-great-grandfather was Rabbi Tsvi Paltrowitch, the Gaon of Nitzy- Novgorod in southwest Russia, the Jewish Chronicle reported.
Source: http://www.vdu.lt/~ktv/kabbalah/paltrowitch.html