“Everything she did, she did 200%,” Lively wrote.

JC Olivera/FilmMagic; Jerritt Clark/WireImage; Jeff Spicer/Getty

TheGossip Girlfamily is mourningMichelle Trachtenbergafterher untimely death at 39.

“Michelle was one of a kind,” Crawford wrote.

Chace Crawford, Michelle Trachtenberg, and Blake Lively

Chace Crawford, Michelle Trachtenberg, and Blake Lively.Credit:JC Olivera/FilmMagic; Jerritt Clark/WireImage; Jeff Spicer/Getty

“I remember her coming on set for the first time and just absolutely owning it.

Just a terrible loss.

“This is the first day I met Michelle.

Blake Lively and Michelle Trachtenberg on ‘Gossip Girl’

Blake Lively and Michelle Trachtenberg on ‘Gossip Girl’.Giovanni Rufino/The CW/Everett

“You knew when she entered a room because the vibration changed.

Everything she did, she did 200%.

Taylor Momsen, who portrayed Jenny Humphrey on the show,remembered Trachtenbergin an Instagram post.

Michelle Trachtenberg attends the 28th Annual Elton John AIDS Foundation Academy Awards Viewing Party Sponsored By IMDb And Neuro Drinks on February 09, 2020 in West Hollywood, California

Michelle Trachtenberg in 2020.Rodin Eckenroth/WireImage

“She was simply awesome.

I’ll miss our late night calls that no one should ever hear but us.

She was always in my corner and there to support me whether I was right or wrong.

I’m still in shock but I needed to honor her, she deserves more than this.

“Been listening to this,” Szohr wrote in her Instagram story caption.

“More than once tonight.

F— she is just wonderful.”

Gossip Girlco-creator Josh Schwartz also wrote a message memorializing Trachtenberg.

“RIP Michelle,” he said in an Instagram story.

“Thank you for Georgina.

You will be missed but not forgotten.”

“Sad to hear this news,” he wrote in an Instagram story.

“We really lost someone special.”

She appeared in all six seasons of the series, with an expanded role in the final season.

Trachtenberg also reprised her role in two episodes of the 2021Gossip Girlrevival.

Trachtenberg’s cause of death is not yet known.

Rodin Eckenroth/WireImage

Trachtenberg’s Georgina was a forceful presence onGossip Girl.

The actress also appeared in films likeBlack Christmas,17 Again,Cop Out, andTake Me Home Tonight.