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Adam Sandler is back at it again in his new film That's My Boy, in which he stars with some new faces to comedy like Leighton Meester and some familiar comedy guys in Andy Samberg and Will Forte. Sandler's co-stars talked to ET about working with him and what he was like on set.

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Singer Ciara said that being in an Adam Sandler movie speaks for itself. "Working with Adam is...amazing. It really is. It's surreal," she said. "He's an icon. He's someone that I've always loved watching and I've always enjoyed...To be able to work alongside him...is a dream come true."

As a comedian, former SNL actor Will Forte grew up idolizing Sandler and said that he took the opportunity of co-staring with Sandler to learn his comedic ways. "He's just so funny and does different stuff than I do so it was fun to watch a master do his comedy," Forte said. "I learned just a ton from him."

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Another former SNL actor, Andy Samberg, admitted that he viciously pursued his role in the film and hounded Sandler because of his desire to co-star with him. "He's actually going for laughs," Samberg praised of Sandler. "Coming to set every day and knowing everybody's working towards trying to make people laugh in the theater--that was fun."

Rapper Vanilla Ice, who was offered the role at Sandler's wife's suggestion, said that it was relieving to find that Sandler was very similar to his on-screen characters like "Happy Gilmore" and "Billy Madison."

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"Sure enough, he's actually like [his characters]," he said of his prior expectations of Sandler being fulfilled. "His office was a mess. He had toys, guitars, instruments, and drums everywhere, so I felt right at home."

Ice also described Sandler's on-set demeanor, which he depicted as fun and laidback. "He does some silly stuff, and then it just inspires you to get silly too," he said of the set's vibe. "It's like when you're at home and nobody's watching...that's what we do. He has a way of capturing that. It's magic."

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Sandler's "magical" comedy ability attracted even Gossip Girl's Leighton Meester, who stepped out of her comfort zone and genre for the project.

"It's totally outside of...anything I've done before in terms of...the scale of the film and it being funny and [a] super raunchy, over-the-top-comedy," she reflected, adding that she grew up watching Sandler.

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Meester said that she signed onto the project because she wanted "to be funny and to try to...step outside my comfort zone and find really odd, crazy things be funny."

Check out the all the interviews with the cast of That's My Boy, in theaters this Friday (June 15), in the video above.