“Pretty Little Liars” stars Tyler Blackburn and Keegan Allen answer fans questions in live-streaming event Oct. 22

PRETTY LITTLE LIARS - Tyler Blackburn stars as Caleb Rivers on ABC Family's "Pretty Little Liars." (ABC FAMILY/MATHIEU YOUNG)

Actors Tyler Blackburn, (Caleb) and Keegan Allen (Toby) will be available to answer “Pretty Little Liars” fans questions during a one-hour Ustream event in anticipation of the special Halloweeen episode of the ABC Family drama airing at 7 p.m. Tuesday, Oct. 23.

The live-streaming event begins at 5 p.m. Monday, Oct. 22 on ABCFamily.com, the official Pretty Little Liars Facebook page, EW.com  and the official Ustream site.

Entertainment Weekly reporter Tanner Stransky hosts the one-hour broadcast, in  which fans can submit questions for the stars to the show’s Facebook page and on Twitter using #PPLChat, according to a news release.

Produced by Alloy Entertainment in association with Warner Horizon Television, “Pretty Little Liars,” is executive produced by I. Marlene King, Oliver Goldstick, Joe Dougherty and Leslie Morgenstein.

Troian Bellisario, Ashley Benson, Holly Marie Combs, Lucy Hale, Ian Harding, Laura Leighton, Chad Lowe, Shay Mitchell, Janel Parrish and Sasha Pieterse also star in the series.

Follow me on Twitter: @MelissaHayer

PRETTY LITTLE LIARS - Keegan Allen stars as Toby Cavanaugh on ABC Family's "Pretty Little Liars." (ABC FAMILY/MATHIEU YOUNG)