Rosamund Pike is pregnant.

The 35-year-old actress is expecting her second child with her partner Robie Uniacke, whom she has been dating since 2009, her representative has confirmed to E! News.

It is not yet known when their new bundle of joy is due.

The couple already have two-year-old son Solo together, but kept the pregnancy underwraps until the star was seven months along and could no longer hide her bump.

Rosamund - whose engagement to director Joe wright was called off a month before their wedding in 2008 - has always said she would like to become a mother and had planned to have more than one child.

She said before the birth of Solo: ''As an only child, you've never known anything else. But I definitely know that I would like my child to have brothers or sisters. But I haven't got a child yet, not yet obviously.''

Meanwhile, Rosamund and Robie, who also has four other children - currently have no plans to tie the knot and are only interested in being loving partners for the time being.

However, the pair did decide to move in together following the birth of Solo to care for the youngster together.