Why Julianne Hough Says She's the 'Worst Bride Ever'

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It's been four months since Julianne Hough announced her engagement to NHL pro Brooks Laich, but don't count on her revealing wedding details anytime soon.

The Dancing With the Stars pro has been so busy with the Fox production Grease: Live that she hasn't had time to plan her walk down the aisle.

WATCH: Julianne Hough Flaunts Engagement Ring

"I haven't even thought about it," she told ET. "I'm, like, the worst bride ever."

The couple began dating in December 2013 after Hough called it quits with Ryan Seacrest. She dated the American Idol host from 2010 to 2013.

Fortunately, all the hard work she's putting into the show seems to be paying off. Olivia Newton-John gave the 27-year-old actress her blessing in taking on her iconic role of Sandy.

"She was, like, 'Oh my gosh! You're going to be great! They couldn't have picked a better Sandy,'" Hough told ET.

WATCH: Julianne Hough Is Engaged to Brooks Laich!

Filling out the cast will be Broadway veteran Aaron Tveit as Danny, Vanessa Hudgens as Rizzo, Carly Rae Jepsen as Frenchy, Kether Donohue as Jan, David Del Rio as Putzie, and Keke Palmer as Marty.

"I'm going to try my best to give a little nod to John [Travolta] and what he does, but hopefully I'll be able to make it my own too," Tveit said.

Grease: Live will air live on Jan. 31 on Fox.