Michelle Trachtenberg - LEAD
Credit: Mark Sagliocco/Getty

She's played a spy, a gossiping villain, an ice skater, and a vampire slayer's little sister. Today? The Hollywood actress, otherwise known as Michelle Trachtenberg, is playing birthday girl—she's turning 31!

Trachtenberg has come a long way since her Harriet the Spy days, and most recently starring in the film, Sister Cities, along with Pretty Little Liars actress Troian Bellisario and model Kaia Gerber. Trachtenberg's been working on her selfie game and we have the Instagrams to prove it.

The former Gossip Girl star's celebrity selfies (not to mention her nostalgic throwback photos!) have collectively made fans swoon with envy at her glamourous squad. In fact, Trachtenberg so frequently updates her Instagram feed with new selfies, she might as well be Kim Kardashian!

Celebrate Trachtenberg's 31st birthday with her best Instagram selfies. Here's hoping the actress will be taking more snaps with her fellow Hollywood friends as she celebrates her big day!

Michelle Tractenberg with celebrity chef Scott Contant

Trachtenberg with model and good friend Lydia Hearst

Trachenberg with Gossip Girl co-star Jessica Szohr and How to Get Away with Murder's Matt McGorry

Tractenberg with designer Zac Posen

Trachtenberg with New Girl's Nasim Pedrad

Trachenberg with Buffy the Vampire Slayer co-star Seth Green

Trachtenberg with Kerry Washington of Scandal

Trachtenberg with Modern Family's Julie Bowen

Trachtenberg with Kelly Osborne and friend Vince Jolivette

Trachtenberg with This Is Us's Mandy Moore and friend Chase Weideman

Trachtenberg with model and Sister Cities co-star Kaia Gerber

Trachtenberg with actor and NBA alum Rick Fox

Trachtenberg with Key and Peele's Keegan-Michael Key

Trachtenberg with Orange Is the New Black's Laverne Cox

Trachtenberg with former Gossip Girl co-star Chace Crawford

Trachtenberg with Modern Family's Sarah Hyland

Trachtenberg with former N'Sync bandmate Lance Bass