Zac Efron on His Girlfriend, Bad Grandpa and Working With Robert De Niro

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The Ellen DeGeneres show was on it's worst behavior today with guest Zac Efron who stopped by to promote his new film Dirty Grandpa. Efron also briefly spoke about his girlfriend, working with Robert De Niro and more.

DeGeneres pointed out that Efron is normally quiet and private but his Instagram page features a couple of photos of him and his girlfriend Sami Miro. Efron told DeGeneres that he was happy and they get to do all sorts of cool stuff together.

They have been together a little over a year and Efron says things are great. Efron dove into talk about De Niro and talked about how fantastic it was to work with him.

However, Efron said that he they had to address the fact that De Niro is a legend and has never seen anything that Efron has been in. He explains the film and raved about the great shape De Niro is in.

Of course, DeGeneres also mentioned the fact that Efron was in pretty awesome shape as well.

Efron was excited to get to know the legend that is De Niro and fans will be able to see the end result when Dirty Grandpa hits theaters Friday, January 22.

Zac Efron's Interview With Ellen DeGeneres

Zac Efron Plays Heads Up With Ellen DeGeneres

Wanna read more on this? Check these out: Does Zac Efron Only Choose Roles that Reveal his Pecs? (more); Adorable Brielle The Periodical Table Expert Returns to the Ellen DeGeneres Show (more).