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Katherine McNamara poses alongside “The Mortal Instruments” author Cassandra Clare at a book signing for her latest novel “Lady Midnight” at Barnes & Noble at The Grove on Tuesday night (March 8) in Los Angeles.

The 20-year-old actress was joined by the rest of the Shadowhunters cast including Harry Shum Jr, Isaiah Mustafa and Emeraude Toubia, who were there to support Cassandra, whose books inspired the television series.

PHOTOS: Check out the latest pics of ‎Katherine McNamara

The new novel is part of Cassandra‘s “The Dark Artifices” trilogy which is the third series in “The Shadowhunter Chronicles.”

The entire cast was extremely excited about the event, taking to social media to share photos throughout the night.

“Happy Lady Midnight launch, Shadowhunters!” Cassandra wrote on her Instagram.

Lily Collins and Jamie Campbell Bower are all dressed up while attending the premiere of their latest flick The Mortal Instruments: City of Bones held at Sony Centre on Tuesday (August 20) in Berlin, Germany.

The 24-year-old English actress and the 24-year-old actor were joined by their co-stars Kevin Zegers, Robert Sheehan, Elyas M’Barek, writer Cassandra Clare, and director Harald Zwart.

PHOTOS: Check out the latest pics of Lily Collins

Earlier in the day, Lily and Jamie were all smiles while being greeted by fans at the airport before the premiere.

FYI: Lily is wearing a Halston Heritage skirt and a Fallon necklace.

25+ pictures inside of Lily Collins and Jamie Campbell Bower attending The Mortal Instruments: City of Bones premiere in Berlin…More Here! »

Lily Collins is sandwiched between handsome co-stars Jamie Campbell Bower and Kevin Zegers while attending a meet & greet for their latest film The Mortal Instruments: City Of Bones at The Americana at Brand on Tuesday (August 13) in Glendale, Calif.

The 24-year-old actress was also joined at the event by co-star Robert Sheehan and author Cassandra Clare.

PHOTOS: Check out the latest pics of Lily Collins

The day before, Lily, Jamie, and Kevin were all dressed up while attending the premiere of the flick in Hollywood.

“We’re tight,” Jamie told E! News at the premiere about his relationship with Lily after they recently split. “Lily and I are very, very close. Very close. Always have been, always will be.”

FYI: Lily is wearing a top and skirt by Bec & Bridge, Christian Louboutin shoes, a Pomellato necklace, a Julieri stackable ring, and Liv Haley earrings.

30+ pictures inside of Lily Collins and Jamie Campbell Bower attending The Mortal Instruments: City Of Bones meet and greet…More Here! »

Lily Collins is glamorous while attending the premiere of her latest film The Mortal Instruments: City of Bones held at ArcLight Cinemas Cinerama Dome on Monday (August 12) in Hollywood.

The 24-year-old English actress was joined on the red carpet by her co-stars Jamie Campbell Bower, Kevin Zegers, and author Cassandra Clare.

PHOTOS: Check out the latest pics of Lily Collins

The day before, Lily was stunning while attending the 2013 Teen Choice Awards, where she presented an award to the cast of Glee.

FYI: Lily is wearing a Cushnie Et Ochs dress with Giuseppe Zanotti shoes and Julieri rings. Kevin is wearing head-to-toe Dior Homme.

15+ pictures inside of Lily Collins and Jamie Campbell Bower attending the premiere for The Mortal Instruments: City of Bones…More Here! »