VIDEO: Julianne Hough Talks 'Dirty Grandpa'; GREASE: LIVE on GMA

Jullianne Hough stopped by GOOD MORNING AMERICA to share what it's like on the set with Robert De Niro and Zac Effron in the new film 'Dirty Grandpa.' The actress and dancer also talks about playing 'Sandy' in FOX's upcoming GREASE: LIVE. Watch the appearance below!

About GMA: ABC News' popular morning program, "Good Morning America," is anchored by Robin Roberts and George Stephanopoulos. Amy Robach is the News Anchor, Lara Spencer is Co- Anchor and Ginger Zee is the Meteorologist.

Now in its 38th year, "Good Morning America" is watched by millions of people who wake up to the show's award-winning combination of breaking news, hard-hitting interviews, exclusive investigations, cutting-edge medical information, and financial reporting. The week of April 9, 2012 "Good Morning America" was the #1 morning newscast for the first time in 16 years, snapping NBC's historic 852-week winning streak.