In the FOXlight: Rachel Melvin of 'Dumb and Dumber To'

It's been 20 years since Harry Dunne and Lloyd Christmas bumbled onto screens in "Dumb and Dumber," and now they're finally back in the long-awaited sequel to this 1994 comedy classic.

And this time around, they're joined by one of their equally dim-witted offspring.

"Dumb and Dumber To" follows the duo (now 20 years older and somehow 20 years dumber) on a quest to find Harry's long-lost daughter Penny, played by up-and-coming actress Rachel Melvin.

"She's very lovable and loves life," Melvin tells Fox News entertainment correspondent Michael Tammero. "And she's very — you know — very naive. And dumb."

Watch the video clip above to hear more from Melvin (including her impressive Jim Carrey impression), then play along as Tammero tests her knowledge of original "Dumb and Dumber" movie quotes!