Celebrity Transformations Happy Birthday, Victoria Beckham and Jennifer Garner! By InStyle Editors InStyle Editors Facebook Instagram Twitter Our editors and writers comprise decades of expertise across the beauty, fashion, lifestyle and wellness spaces in print and digital. We prioritize journalistic integrity, factual accuracy, and also having fun with every story we share. InStyle's editorial guidelines Published on April 17, 2012 @ 09:15AM Pin Share Tweet Email Photo: RD/ Kirkland/ Retna Digital; Mike Marsland/WireImage It's a big day for Hollywood birthdays! Victoria Beckham is celebrating her 38th today, while Jennifer Garner is blowing out 40 candles. In honor of the occasion, take a look back at Jennifer's Hollywood transformation in the gallery, from a dimpled high-schooler to a glamorous mother of three. MORE:• Who Else Turns 40 This Year?• Jen and Ben Welcome Son, Samuel!• See Victoria's Hollywood Transformation• Victoria Works a New Long Bob