The couple – who have been together for several months – are said to be thrilled with the happy news but although they expecting a child they “don’t have plans right away to marry”.

Apparently, friends of Miller have given actor Sturridge the seal of approval and are delighted for the couple and “not surprised by the news of the pregnancy”.

This is what Sienna Miller’s boyfriend, Tom Sturridge, looks like if you were wondering

A source said: “Her friends are really happy with her relationship with Tom. He’s younger, yes, but he’s mature and he’s a good guy … They’re really good together. They just spent the holidays in Paris together after they announced the news in London.”

Miller began dating Sturridge – who is friends with Robert Pattinson – just a few months after she split from fiance Jude Law for a second time in February 2011.