Jennifer Aniston is pleased her ex-husband Brad Pitt has fathered twins, insisting to a friend she hopes the new arrivals are "beautiful".

Pitt's actress partner Angelina Jolie gave birth to son Knox Leon and daughter Vivienne Marcheline by Caesarian section at the Fondation Lenval hospital in France on Saturday.

But the former Friends star - who was married to Pitt for five years - apparently bears no ill will towards the new father, despite the fact their marriage was rumored to have dissolved over her unwillingness to start a family.

The friend tells U.S. magazine Us Weekly that Aniston "hopes the twins are beautiful. She'd never want anyone to be unhappy with their kids".