Blake Lively Hair
Credit: Getty Images; Time Inc Digital Studio

Happy birthday, Blake Lively! The Gossip Girl star turns 25 today, and while the show's plotlines have many unexpected twists, one thing remains constant: Serena Van Der Woodsen's flawless strands. To celebrate Lively's birthday, try on her Old Hollywood waves in our Hollywood Makeover Tool! Upload your picture to get glamorous red carpet ringlets in five seconds flat -- no curling iron required. Then, share the makeover on your Facebook or Twitter to see what your friends think of your Upper East Side-approved look. Head over to the Hollywood Makeover Tool to start now!