United Kingdom, Jan. 7 -- Nikki Glaser has been warned off making jokes about "America's sweetheart" Julia Roberts at the Golden Globe Awards.

The 41-year-old comedian will take to the stage at the Beverly Hilton in Beverly Hills, California, on Sunday (11.01.26) to host the glitzy awards ceremony for the second year in a row, but she will play it safe when talking about the Pretty Woman star after receiving no-nonsense fan feedback in Los Angeles.

Speaking on CBS Mornings, she said: "I'm trying out my monologue around L.A., at the clubs here, and just even any joke about Julia Roberts, they are not there for.

"You cannot make fun of America's Sweetheart. So, whatever I end up saying about her, that is the most fine-tuned joke that I'v...