Announcing the news via her Facebook page on Wednesday (February 16), the "Sin City" actress wrote, "It's been a while since I've been on FB & I thought I'd drop by to let you all in on some exciting news > Honor is going to be a Big Sister!"
Miss Alba continued, "Cash and I are thrilled and wanted to share the news directly with you so you didn't hear about it somewhere else."
The brunette beauty, who married Mr Warren in May 2008, finished, "I appreciated all of the love and support you all gave me during my first pregnancy and will definitely appreciate it again this time around. Have a great day! Jess."