Jessica Alba took to Facebook yesterday to announce to her fans that 2011 will be a very special year for her and husband Cash Warren. "I thought I'd drop by to let you all in on some exciting news. Honor is going to be a Big Sister!" She added: "Cash and I are thrilled."

Unlike the other famous moms-to-be out there - a list that includes Natalie Portman, Marion Cotillard, Kate Hudson, and Alicia Silverstone - this is Alba's second pregnancy. In 2009, she gave birth to her first daughter, Honor.

The 29-year-old is also a "green mom" and admits she's passionate about creating an environment that's healthy for her children.

"I'm very strict with her," she said in a 2010 interview about daughter Honor. "She's healthy and on a schedule. We eat organic, our house is all green, we don't waste. It's more about having as green a house for my daughter as possible."

"I would like to see a cleaner earth for my child," she added.

Check out a video below of Jessica talking about the green changes she's made in her life -- from installing a lawn made from recycled tires to composting.

Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

Jessica Alba announces she's pregnant
Green mom the latest celebrity to join the massive baby boom underway in Hollywood.