"Dear Twitter, My water broke. It wasn't like Charlotte in Sex and the City. Now, timing contractions on an iPhone app," Sara tweeted late Monday from her cell phone.
"The Contraction Tracker was fun until the contractions got painful," she followed up.
It was her husband, though, who announced the baby's birth Tuesday afternoon.
"Yes! @sara gave birth to a perfect baby boy. Both are well. 8 pounds, 21 inches! Smiles all around," Evan texted.