"Hello peeps All good. Just fallen in unconditional heartbreaking divine love for the second time," the actress wrote to her 537,000 followers on July 10.
The British actress is already a mother to five-year-old Wylie, whom she shares with ex-husband Peter Loughran. She has yet to reveal the father of her newest bundle of joy.
The actress announced her pregnancy in February, revealing that she was expecting a girl. The announcement came via a lengthy blog post she did on planusa.org titled "Daughter."
"My daughter will have freedom of choice. She will be free to dance, to sing, to be educated in the fields that spark her passion, to marry if she wants, to marry WHO she wants, to remain single, or to fall in love with another woman. She'll be able to wear what she wants, put on lipstick, and read books that spark debate and expand her mind."
She continued her post on women's rights, speaking about her then-unborn daughter. "She will be loved, protected, respected, and celebrated. All these things that should be, and will be, basic human rights, are a promise to my daughter."