India, Aug. 23 -- Australian actor Margot Robbie is finally opening up about motherhood - and in her own words, it's simply "the best."

The Birds of Prey actor, who welcomed her first child with husband Tom Ackerley last year, spoke about parenthood while promoting her upcoming film A Big Bold Beautiful Journey, set to release on September 19. Sitting down with Entertainment Tonight, Margot admitted that it's hard to put the experience into words. "If you try to explain it to someone who has kids, you don't need to because they get it," she said. "And if they don't, it's probably just really boring to hear. So, you're just kind of like, 'It's the best'," she said.

The 35-year-old and Tom, her partner of more than a decade, quietly welco...