The Other Boleyn Girl (2008)

King Henry VIII (Eric Bana) lacks an heir. Seeing this as an opportunity for personal gain, the Duke of Norfolk (David Morrissey) and Sir Thomas Boleyn (Mark Rylance) persuade Thomas' daughter Anne (Natalie Portman) to seduce the king. But Henry falls in love with Anne's sister, Mary (Scarlett Johansson), instead. When Mary becomes pregnant, she's confined to bed, with charged with Anne keeping the king from straying -- but the plan backfires when Anne seeks the king's affections for herself.