When you post you “Happy Birthday” messages to Justin Timberlake today, don’t forget to include “Congrats on the new baby.” The 34-year-old singer confirmed the preganacy of his wife, actress Jessica Biel on Instagram today (Jan. 31). In his caption, Timberlake revealed that they have not learned the sex of their baby. “Thank you EVERYONE for the Bday wishes! This year, I’m getting the GREATEST GIFT EVER. CAN’T WAIT. #BoyOrGirl #YouNeverKnow #WeDontEvenKnow#WeAreTakingBets,” he wrote. Since their 2012 nuptials, Timberlake and Biel have remained relatively private regarding their relationship. And since the news of their family’s addition surfaced, neither publicly addressed their pregnancy – until now. It is safe to say that the Daddy-to-be is in good spirits with this big reveal. No word on when Mommy-to-be is due, but from the looks of things, the masses may not find out right away. Congrats and happy birthday, Mr. Timberlake! SEE ALSO: Review: Justin Timberlake’s ’20/20 Experience’ Returns To Barclays