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.