Sienna Miller is set to walk down the aisle, and welcome a Baby in 2012!

The Layer Cake star and her boyfriend, Tom Sturridge, are engaged, and expecting their first child this year, according to Life & Style.

Miller and her 26-year-old beau got together shortly after she ended her relationship with Jude Law and the couple moved in together this past summer.

Sturridge popped the question over the holidays in a very lavish way!

Life & Style reports:

    "He proposed to Sienna during their romantic trip to Paris after Christmas. He filled their hotel suite at the Ritz with flowers and presented her with a vintage Victorian ring. It was incredibly romantic she was blown away."

According to US Weekly, Miller's family "had had it with Jude Law and his cheating and all the back and forth." The actress had a tumultuous on-and-off relationship with fellow Brit, Jude Law, before finally calling it quits in February.

Miller's rep refused to confirm the news, saying only: "We don't comment on our client's personal lives at all."

Congrats to the happy pair!