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There are two geniuses behind Pretty Little Liars: Marlene King, who created the show and is the showrunner; and Sara Shepard, who wrote the beloved book series that inspired the TV series. Today, December 19, these creative minds join forces on Twitter!

Today at 6 p.m. ET/3 p.m. PT, Sara and Marlene will take to Twitter for a live chat where they'll discuss the girl at the center of it all: Alison DiLaurentis (Sasha Pieterse).

This event celebrates Sara's newest book, Ali's Pretty Little Lies, which goes on sale on January 2, 2013. To join in the fun, you can follow the "Twitterview" here, and you can comment on the conversation with the hashtag #pllalibook.

Will you be tuning in on Twitter?

Catch the return of PLL Season 3 on Tuesday, January 8, 2013 at 8 p.m. ET/PT on ABC Family.

Source: Alloy Entertainment