Keira Knightley is still adjusting to her engagement, and feels torn over decisions like where to spend her first Christmas after marrying James Righton.

The Atonement star, who announced her engagement to the Klaxons rocker in May (12), usually spends the festive season with her parents and brother Caleb, but may now celebrate with Righton and his family instead.

She tells Vogue magazine, "It's no longer 'I' but that big old 'we'... I have no idea (where to spend Christmas); it's a massive question. My family was just four and very simple. Now all of a sudden it's breaking into different parts. I cannot imagine my mother letting us go."

Knightley has also been wrestling with bigger issues, such as her balancing her career and starting a family.

She adds, "I don't want to deny my femininity. But would I want to be a stay-at-home mother? No. On the other hand, you should be allowed to do that, as should men, without being sneered at."