'Pretty Little Liars' on fire at ABC Family

Network orders 12 more episodes of freshman series

Three episodes into its premiere run, "Pretty Little Liars" has earned itself a 12-episode extension, bringing its total first-season order to 22 hours.

ABC Family had positioned "Liars" as the centerpiece of its spring upfront presentations, and the cable network's confidence in the series appears to have paid off. According to Nielsen, the June 22 installment of the show delivered 2.74 million viewers, an improvement of 11% from the 2.47 million who tuned in for the premiere.

"Liars" also has built on its already significant demos, averaging 1.33 million viewers 18-49 on June 22, topping its debut delivery by 20%. The younger set also continues to flock to the series, as ABC Family set a high-water mark with the third episode, drawing 1.84 million viewers 12-34 (up 6% from the June 8 premiere) and 1.58 million females 12-34 (up 5%).

" 'Pretty Little Liars' is a breakout hit for the network," said Kate Juergens, executive vp original programming & development at ABC Family. "We're thrilled that our millennial viewers have responded so strongly to the show. It's a perfect fit with the network's strong slate of original scripted dramas."

Based on a series of best-selling young-adult novels, "Liars" stars Lucy Hale, Troian Bellisario, Ashley Benson and Shay Mitchell.