Sandra Bullock's Son Louis Has No Idea His Mom Is an Actress

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Sandra Bullock has a starring role in Minions -- which is a part of one of her son's favorite franchises -- but she admitted at the London premiere that he probably won't realize it.

"Louis has no idea that I'm in this film," Bullock told ET of her five-year-old son. "He won't put two and two together -- at least not anytime soon. If he does, I'll be shocked. The kid surprises me all the time."

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The 50-year-old Oscar winner lends her voice to the character of Scarlet Overkill in the animated movie. The minions' search for a new evil master leads them to Overkill, the world's first super-villainess, who, alongside her inventor husband Herb (Jon Hamm), forms a plot to take over the world.

Bullock was first introduced to the minions by her son, who fell in love with the Despicable Me franchise. Bullock told us that he watched the original movie "over and over again."

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"That was the first introduction, then came Despicable Me Part 2," Bullock said. "That was another 300 views."

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Not only does Louis not know about his mom's new role, she's somehow kept it a secret that she's an Oscar-winning actress.

"He has no idea what an Oscar is," Bullock said. "He's not seen it, doesn't know what it is ... He doesn't know what I do. I just go to work."

Minions opens July 10.