She was the older of two children born to the couple and had numerous half brothers and sisters as a result of her mother's affair with Louis XIV of France.
When her father found out about the affair between the King and her mother, Montespan decided to take his children away to his country estate before raising a scandal at court, challenging the king one day at Saint-Germain-en-Laye and decorated his carriage with antlers (like horns, these were traditional symbols of the cuckolded husband).
He was promptly imprisoned in the For-l'Évêque, then exiled to his lands - taking young Marie Christine and the even younger Louis Antoine.
This did not stop his agitation, and he not only came to Paris nearly every year between 1670 and 1686 but also commanded an annual requiem mass to be sung for his wife during her lifetime.
Twelve-year-old Marie Christine died at the Château de Bonnefont, one of her father's castles in Gascony.