Sienna Miller is reportedly pregnant.

According to Us Weekly that the star is expecting her first child with boyfriend Tom Sturridge.

Friends and family are thrilled for the 30-year-old actress and her 26-year-old lover.

"Friends are really happy with her relationship with Tom," a source told Us Weekly. "He's younger, yes, but he's mature and he's a good guy. We're not surprised by the news of the pregnancy. They're really good together," The source added.

The source also revealed that the British star and fellow actor Tom don't have any plans to marry in the future.

The pair enjoyed a romantic getaway together over the festive period.

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

Sienna was well known for her high profile relationship with Jude Law. The couple split up the second time last February. They first split in 2006 after two years of dating when Jude admitted to cheating on the star with his children's nanny.

Sienna has now put Jude firmly behind her.

"[Sienna and her family] had had it with Jude Law and his cheating and all the back and forth," the source explained.

Sienna's representation have yet to comment on the news. Tom's representation remained tight lipped about the subject.

"We don't comment on our client's personal lives at all," they told Us Weekly.