Will Ezra Fitzgerald's mom approve of his underage girlfriend?

In Tuesday's all-new episode of Pretty Little Liars, Ezra (Ian Harding, 25) gets a surprise from his mother, Dianne (Mary Page Keller, 51). Within moments, Ezra' girlfriend and former pupil Aria Montgomery (Lucy Hale, 23) unexpectedly comes face-to-face with his mother for the very first time.

"It's such a pleasure to meet you, Mrs. Fitz," a bewildered Aria says.

"Fitzgerald," Dianne corrects her. "Ezra likes to truncate the name for some reason, but call me Diane. . . I'm so glad to finally meet the mysterious girl with the lyrical name."

After making some small talk, Dianne invites Aria to join her at a museum benefit the following night -- but Ezra isn't keen on the idea of them spending time together. "It's kind of short notice, mom," he says.

Will Aria show up for the benefit? Watch the clip above to find out and tune in for an all-new episode of Pretty Little Liars, airing Tuesday at 8 p.m. EST on ABC Family.