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!