Sandra Bullock, Oscars

Jordan Strauss/Invision/AP

Many might argue that Sandra Bullock is one of Hollywood's best comic actresses. But the star says that if you ask her three-year-old son, Louis, Mom isn't all that hilarious.

"He doesn't find me funny at all!" Bullock told E! News at the New York City premiere of her new movie The Heat.

"The only time he thinks I'm funny is when I go, ‘You know you need to go to bed.' He goes, ‘You so funny mamma. You so funny.'"

Trouble is, Bullock isn't joking around when bedtime approaches. "He knows exactly what he's doing," the actress joked when describing how her son delays saying goodnight. "But he's hilarious. He is hysterical."

As Bullock tries to make America laugh with her costar Melissa McCarthy in the highly anticipated summer comedy, she knows what her priorities are with Louis.

"I'm just here to change diapers and feed him and make money for school," Bullock said. "That's my purpose here and it's worth it."

To hear more from Bullock and McCarthy at The Heat premiere, watch E! News tonight at 7 p.m. and 11:30 p.m.

PHOTOS: See more adorable photos of Louis and other famous kids

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