Lending her support for literature, Lily Collins was on hand for Cassandra Clare’s book signing in Los Angeles on Thursday afternoon (March 21).

The 24-year-old actress looked stunning in a leather vest with boyfriend jeans and pumps and she greeted fans and cheered on the “The Mortal Instruments: City of Bones” author.

Miss Clare released her brand new novel "Clockwork Princess,” which is the third book in her Clockwork series.

In regards to Miss Collins, she is getting ready for the release of her “City of Bones” film, which is based off of Cassandra’s novel.

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