"Her being on [The X Factor] is the most exciting thing that's happened to me in such a long time," Robert, 28, gushed. "I'm so excited about it."
Robert's upcoming film Maps to the Stars deals with chasing fame and how it affects those going after it. In the movie, Robert plays limo driver Jerome Fontana. With all the fame and accomplishments that he's attained, Sangita had to wonder how the actor keeps himself grounded.
"I don't," Robert joked. "I just limit the amount of time I talk per day, so that I don't start spiraling out."
In addition to chatting about his sibling, Rob also talked about the royal family's baby news.