"Twilight" star Kristen Stewart is angered when critics question her dedication to her career.

She explained, "(I don't care if) people go onto the internet and say I'm ugly. (But) I hate it when they say I'm ungrateful, and I f**king hate it when they say I don't give a shit, because nobody cares more than I do."

Meanwhile, Robert Pattinson and Kristen's closest aides have confirmed the actors are dating "100 percent" in an off-air chat with Oprah Winfrey. A source who was at the taping of the episode, says, "Both Rob and Kristen's people then confirmed ahead of time they are together and are dating. One hundred percent."

See more photos of Kristen here!