Michelle Trachtenberg's unexpected death shocks Blake Lively

Blake Lively, who shared screen with Michelle Trachtenberg in Gossip Girl, was truly heartbroken at the shocking news of her friend’s death.

Blake, who is making headlines with on-going lawsuit, took to Instagram on Wednesday to share a picture of Ice Princess actress’ first day, where she was beaming as she smiled wide at the 37-year-old actress.

In a special tribute to the late co-a, the A-list Hollywood actress captioned the throwback picture with a long heartfelt note, calling her “electricity.”

“You knew she entered a room because the vibration changed." She was authentic as she "laughed the fullest at someone’s joke, she faced authority head on when she felt something was wrong,” wrote the actress about TV star’s lively nature.

According to the American actress, EuroTrip star was a detail-oriented person who loved to create “a nice experience for anyone who was in her orbit, even down to subtle smell of her lipgloss.”

Ryan Reynolds’ wife deeply misses The Hill leading lady’s presence as she ended her beautiful tribute with a thought-provoking note for everyone, saying: “You take for granted that you get the chance to see an old friend.”

“Hold those you love and have loved dear,” she added.

How did Michelle Trachtenberg die?

Michelle Trachtenberg, known for her role in Buffy the Vampire Slayer, passed away at the age of 39. She was found dead in her apartment on Wednesday 26 by her mother. The actress was reportedly experiencing liver transplant complications and organ rejection.

How were Michelle Trachtenberg and Blake Lively related?

Blake Lively starred in a teen-hit show alongside Michelle Trachtenberg. Although Blake seemingly regrets not connecting with her “fiercely loyal friend” in long time, the mother-of-four expressed her remorse with a lengthy note to honour the departed soul.

RELATED: Michelle Trachtenberg's sudden death shocks fans: Cause revealed