People.com Celebrity Parents Jessica Alba on Letterman -- they know the sex, they aren't sharing! By Staff Author Published on January 29, 2008 12:42 AM Share Tweet Pin Email Although she made a remark to the contrary last week — perhaps to protect her privacy or because they hadn’t yet made a final decision — Jessica Alba revealed on the Late Show with David Letterman this evening that she and fiancé Cash Warren do know the sex of their baby — but they aren’t sharing! Um…I haven’t…I’m not saying anything. Um…I might know. [laughs] While being teased by Dave for being ‘just a kid’ herself, the 26-year old actress also narrowed down the due date mystery a bit — looks like the ‘late spring’ part of the announcement means May, as Jessica mentioned the baby will arrive after her April 28th birthday. I’m in my late 20s — I’ll be having the baby when I’m 27! So, it’s not too early in the game. Expounding a bit on her earlier ‘all day sickness’ comments, Jessica revealed, I’m in the second trimester. The first one was hairy. It was all daysickness. It wasn’t very fun. Then you’re just expanding in places[you’re not expecting], and you’re just like, ‘What? Why? What’s goingon here?!’ I’m feeling much better. Source: The Late Show with David Letterman Click below for video.