Gillian Anderson's British Baby Bump

Gillian Anderson and costar David Duchovny, aka Mulder and Scully, arrive at the UK film premiere of The X-Files: I Wanted To Believe at the Empire Cinema on Wednesday in London.

The pregnant actress, 39, is due to give birth to her third child later this year with partner businessman Mark Griffiths (pictured below).

The X-Files mulled in a mediocre $10.2 million this past weekend, behind The Dark Knight ($75.63 million), Step Brothers ($30 million) and Mamma Mia! ($17.9 million).

20+ pictures inside of Gillian Anderson‘s British baby bump…