Scott, 49, was found dead in her Chelsea apartment on March 17. Her death was ruled a suicide by hanging, according to police.
Her passing shocked Jagger who was on tour at the time in Australia with the Rolling Stones. He canceled all of the band’s shows to mourn her death.
The procession was solemn at St. Bartholomew’s Church.
Notables such as Vogue Editor Anna Wintour, actress Julianne Moore, Director Martin Scorsese, Director Baz Luhrmann, Sarah Jessica Parker and tennis great John McEnroe were spotted arriving.
Meg Ryan, Olivia Munn and Renée Zellweger were also spotted in the crowd.
Inside, Jagger sang a moving version of Bob Dylan song “Just Like a Woman. Lisa Fischer, one of the Stones’ long-time backup singers followed with a rendition of “Amazing Grace.”
Jagger, Parker, Scott’s brother, Randy Bambrough, actress Ellen Barkin and fashion journalist André Leon Talley made tributes during the ceremony Jagger’s publicist said in a statement.
Scott’s niece, Hannah Bambrough, and Jagger’s son, James Jagger read poems. Sir Mick’s grandchildren, Mazie and Zak, read the Twenty-Third Psalm from the Bible.
Scott was found by an assistant hanging by the door handle with one of her own designer scarves around her neck.
Reports, later disputed, claimed Scott’s fashion business was teetering on bankruptcy, millions of dollars in debt, although her $3.6 million Chelsea apartment was reportedly debt free.
L’Wren was also determined not to ask Mick for financial help, according to friends.