By InStyle Staff
Mar 03, 2012 @ 8:00 am
Picture Group; WireImage

What a day for Hollywood birthdays! Modern Family's Julie Bowen turned 42 today, while Jessica Biel celebrated 30. Happy birthday, ladies! Click through the gallery to see Biel's trasformation from 7th Heaven cutie to big-screen bombshell!

MORE:• Jessica Biel's New Bangs!• Jessica Biel's Wedding-Worthy Hair• Stylish Couples: Jessica and Justin• How Julie Bowen Wears Tangerine• Julie Bowen's SAG Style