Andrea Cipriani Mecchi
Weiner and her husband, Adam Bonin, welcomed their 7-lb. new addition (who joins big sister Lucy, 4) Friday morning in Philadelphia.
"We're ecstatic!" Weiner, 37, tells PEOPLE.
The author, whose novel In Her Shoes was made into a hit film starring Cameron Diaz, may have two small children to look after, but another new addition will soon be on the way: Her latest book, Certain Girls, hits shelves in the spring.
– Rennie Dyball
