Los Angeles: Actress Sienna Miller who is dating Tom Sturridge since last year is reportedly expecting her first child.

Miller, 30, started dating Sturridge, 26 after her relationship with Jude Law ended for a second time, according to reports.

They "don't have plans right away to marry, if at all. Friends are really happy with her relationship with Tom. He's younger, yes, but he's mature and he's a good guy."

The couple are yet to confirm the news but Miller's sister hinted about it by posting 'THRILLED' on her twitter page on Saturday.

Miller and Sturridge's friends "were not surprised by the news of the pregnancy. They're really good together.

"They just spent the holidays in Paris together after they announced the news in London," said the source.