08/15/2011 at 08:00 AM EDT
and husband Cash Warren have added another little girl their brood: baby Haven Garner Warren.
"She was born on Saturday, weighed 7 lbs. and was 19 inches long," Alba wrote on her official Facebook page
, announcing the happy news. "Healthy and happy! Big sister Honor couldn't be more excited about the new addition to our family."
"Thank you for all of your support during my pregnancy," the post continued. "It means the world to me."
Daughter Haven joins big sister Honor
Alba first announced her latest pregnancy via Facebook and Twitter in February. Shortly afterward, both she and Warren shared their happiness
online as well.
"Can't tell you how much the positive tweets mean," Warren wrote on his Twitter at the time. "Smiles from ear to ear. lots of love back at cha."
Alba, 30, added via her account at the time: "I can't thank you enough for all of the wonderful messages you sent me today."
On Monday, Alba's rep confirmed the actress's happy news to PEOPLE.