Elle Fanning shows off her slender frame promoting Sidney Hall as stars turn out for day five of Sundance Film Festival

And Elle Fanning, 18, was busy promoting Sidney Hall at the Sundance Film Festival in Park City, Utah on Monday.

The young actress appeared beyond her years in chic black pants that came up past her waist.  

She paired the statement trousers with a simple white top that she tucked into the black pants to show off her long legs. 

The gorgeous starlet appeared to wear very little makeup for the event, highlighting her natural beauty.

She wore her blonde locks, parted down the middle, straight and sleek past her shoulders. 

She opted for zero accessories, opting to keep her look simple and elegant. 

The rest of the cast also joined the leading ladies to discuss the upcoming film, set to premiere for the first time at the festival. 

Logan Lerman plays Sidney Hall, a young novelist who writes a generation-defining book that makes him world-famous. 

After writing the book, and catapulting to fame, he embarks on a downward spiral that ultimately threatens to destroy him.

The story shows Sidney at various times in his life over the span of 12 years. 

The cast moved on to a Variety-sponsored event at the Festival, still in great spirits as they answered more questions about their featured film. 

Blake Jenner and director Shawn Christensen also joined the cast to discuss the film, alongside moderator Kevin Smith. 

Elle kept her co-stars laughing and enjoying the day with her infectious giggle as each photo seemed to show her more excited than the next.