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Zac Efron And Robert De Niro Team Up For This Super Hilarz 'Funny or Die' Vid!

These two are adorbs!

Dirty Grandpa co-stars Zac Efron and Robert De Niro have teamed up to shoot a hilarious new Funny or Die sketch vid!

In the footage, the former High School Musical star attempts to persuade the veteran actor to wish his girlfriend Sami Miro a happy birthday via his iPhone camera. De Niro plays a super-serious persona and refuses to sing Happy Birthday to Zac's girl, or even smile as he toasts her big day with balloons, streamers, and a party hat.

Growing tired of Zac's requests for a happier happy birthday message, De Niro finally snaps and tells the hunk, "With all due respect, the two of you can go f**k yourselves. Did you hear that Sami? The two of you can go and suck my d**k!'"

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But Zac appears to be thrilled with the outburst, turning the iPhone camera on himself and beaming, "Oh my God, you better love that." 

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Here's another LOL video, this time with DeNiro giving Zac "acting lessons."