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Stars including Meg Ryan, Renee Zellweger, Sarah Jessica Parker, Julianne Moore and Anna Wintour stepped out to remember the fashion designer at St. Bartholomew's Church in Midtown.
Olivia Munn, Graydon Carter, Martin Scorsese, Simon Doonan, Baz Luhrmann and Daphne Guiness also attended the cermony.
L'Wren's long-term partner Mick Jagger reportedly performed Bob Dylan's song Just Like a Woman at the private memorial and her brother Randy gave a heartfelt reading.
Poems were read by L'Wrens niece, Hannah Bambrough and Mick's son, James Jagger while the singer's grandchildren, Mazie and Zak, read Psalm 23.
Mick Jagger and L'Wren Scott's love story in pictures
The 49-year-old was found by her assistant inside the Eighth Floor apartment around 10am New York time, and there was no suspicion of foul play.
Mick and the Rolling Stones cancelled their Australian tour when they heard the news, and Mick has spent the last week at the Beverly Hills Hotel.
Mick and L’Wren met in 2001 on a photoshoot. They were quickly inseparable, and reports that suggested L’Wren was not fully accepted in the Jagger clan have been soundly rejected.