Blake Lively only gave birth to her first child four months ago, but she?s already showing off a teeny, tiny waist! The 27-year-old actress shared a photo with her sister at the Age of Adaline press conference on Sunday, posing with her hand on her waist in a purple and black peplum skirt that revealed an already slimmed-down post-baby body . ?My boobs are pretty huge and awesome,? she told Us Weekly , adding jokingly, ?That?s probably the most thing significant change ,about being a mom.???